FLIGHTS · CHECK-IN AND BOARDING PILLAR

Online Check-in and Boarding Pass Guide

Check-in once meant a queue at the airport. Today it starts on your phone the day before, and the boarding pass lives in your pocket. This guide explains how modern check-in and boarding work, online or at the counter, so you reach the gate calm, early and in the right place.

Last verified: 21 September 2026 · By the AllOverBooking Editorial Team · Reading time: about 26 minutes

There is a particular calm in walking into an airport with your boarding pass already on your phone, knowing your seat, your gate area and your timings before you reach the terminal. That calm is entirely learnable. Check-in and boarding follow a predictable rhythm once you understand the pieces, so this guide walks through all of them the way an experienced traveller would explain it to a friend flying for the first time.

What is online check-in and what is a boarding pass?

Online check-in lets you confirm your seat and collect your boarding pass before reaching the airport, using the airline's app or website. The window usually opens a day or two before departure and closes a set time before the flight, after which you check in at the airport instead.

A boarding pass is the document, printed or digital, that proves you are checked in and lets you pass security and board. It shows your name, flight, seat, boarding group, gate and boarding time, alongside a scannable code. You can carry it in Apple Wallet or Google Wallet, as a PDF, or on paper. Because exact windows, deadlines and rules differ by airline, airport and route, confirm yours in the airline's own app before you travel.

Quick Facts Snapshot

What check-in actually does: Turns a reservation into a confirmed seat and issues your boarding pass
When the online window opens: Usually a day or two before departure, although every airline sets its own
When it closes: A set time before the flight, after which the airport counter takes over
The safest way to carry a pass: A mobile wallet pass that works offline, plus a printed or PDF backup
The field people misread: Boarding time, which comes well before departure time
The habit that prevents most problems: Re-checking your gate on the airport screens, because gates move

Who this guide is for. First-time flyers who want the whole sequence explained, and regular travellers who want the edge cases: gate changes, missed cut-offs, connections and document checks. It describes how check-in works industry-wide rather than quoting any one airline's deadlines. If baggage is your next question, our cabin against checked baggage comparison covers it.

What check-in actually means

Check-in is the moment you tell the airline you are definitely flying. It confirms your seat, issues your boarding pass, and moves the booking from reserved to ready to board. The step exists so the airline knows exactly who is on board, can manage seating and weight, and can release seats nobody claimed.

Whether you do it on your phone or at a check-in counter, the outcome is identical. You end up with a valid boarding pass tied to your booking reference, which many airlines still call a PNR.

Where each version happens

Online check-in, also called web check-in, happens through the airline's app or website before you travel. Airport check-in happens in person at a counter or a self-service kiosk. Both produce the same boarding pass, so the difference is where and when you do it, and how long you spend inside the terminal. Most travellers now check in online and use the airport only for bag drop and security.

Online against airport check-in

Two routes lead to the same boarding pass. Here is what each one asks of you, and what it gives back.

Online check-in and airport check-in compared across six factors
Factor	Online check-in	Airport check-in
Where it happens	App or website	Counter or self-service kiosk
When it opens	Usually a day or two before	When the counter opens that day
Time it saves	Most, since you skip the queue	Less, because you queue
Document checks	Partly self-declared	Staff verified in person
Suits	Light packers and simple trips	Complex trips and assistance
Pass format	Mobile or PDF	Printed on the spot

What each route is good at

Seat choice: go online, because you pick or confirm while choice still exists.
Speed: the pass reaches your phone before you leave home.
Cabin-only trips: nothing at the counter concerns you, so head for security.
Document checks: use the counter, where staff verify passports and visas face to face.
A printed pass: a kiosk produces one in a couple of minutes.
No online option: the counter covers routes where the airline offers none.

Why checking in online pays

The appeal is simple. Online check-in moves the slowest part of the airport experience to your sofa. You confirm your seat while more choice remains, you skip the check-in queue entirely if you travel with cabin bags alone, and you arrive already holding a pass. For families and nervous first-time flyers in particular, that head start turns a stressful morning into a manageable one.

Where online wins

Skip the check-in queue with cabin-only bags.
Better seat choice, since you go first.
Boarding pass ready on your phone before you leave.
A calmer, faster arrival at the terminal.

Where the counter still wins

Complex visa or entry-document checks.
Special assistance or medical needs.
Group bookings, infants and unusual routings.
Any route where the airline does not offer online check-in.

Matching the method to the traveller

No single answer fits everyone, because the right method depends on your trip and how you like to travel. As a rule, the simpler the journey and the lighter the packing, the better online check-in suits you. The more moving parts a trip carries, such as documents, assistance, infants or unusual routings, the more a person at the counter earns their place.

Frequent flyers: online. Check in the moment it opens, then walk straight to security.
Families: online, then bag drop. Ask staff about family boarding while you are there.
First-time flyers: either, although arriving early matters more than the method.
International tourists: online, yet expect a document check at the counter.
Travellers needing assistance: the counter, where staff can confirm arrangements directly.

The step-by-step sequence

Every airline's app looks a little different, yet the flow stays remarkably consistent. Once you know the pattern, you can check in with any carrier in a couple of minutes.

Six steps, start to finish

Open the app or website. Sign in, or pull up the trip with your booking reference and surname.
Start check-in. Select the flight, then confirm which passengers on the booking are travelling.
Confirm details. Enter or verify passport and travel-document details wherever the route requires them.
Choose your seat. Pick or confirm a seat, since some carry no charge while others do.
Add bags if needed. Pay for any checked bag here, because it costs less than at the airport.
Collect the pass. Download it, save it to your wallet, or email it to yourself.

From experience. Take a screenshot of the pass and save the PDF as well. Airport wi-fi and mobile signal fail at the worst moments, so an offline copy has rescued more than one traveller standing at a scanner.

The boarding pass explained

A boarding pass is your proof that you are checked in and cleared to fly. It carries everything the airport needs to move you along: your name, flight number, date, seat, boarding group, boarding time, and a scannable code. Security uses it to let you airside, while the gate agent scans it to board you. Reading it confidently is the difference between drifting through a terminal and knowing exactly where to be, and when.

What each field on a boarding pass tells you
Field	What it tells you
Gate	Where you board, although you should always re-check the screens
Boarding time	When boarding starts, which is well before departure
Seat	Your assigned seat on the aircraft
Group or zone	The order in which staff will call you to board
Scannable code	The code read at security and again at the gate
Sequence number	The order in which you checked in, which occasionally matters for seating

Formats a pass comes in

A boarding pass arrives in several formats, and they are largely interchangeable. Use whichever suits you, then carry a backup in a second format. The mobile pass is the modern default, whereas the printed pass remains the fallback that still works with a dead phone.

Mobile pass. Lives in the airline app or your phone wallet, scanned straight from the screen.
Printed pass. Paper from home, a kiosk or the counter, needing no battery and no signal.
PDF pass. Downloaded and stored offline, or printed later on any device you reach.
Email pass. Sent to your inbox after check-in, so you can open it offline or print it before leaving.

Best practice. Carry two formats: a mobile pass for speed, plus a printed or PDF copy as insurance. Some airports and some international routes still prefer a printed pass, so check what your airline says for that particular route.

Saving it to a mobile wallet

Adding your boarding pass to Apple Wallet or Google Wallet is the single best mobile habit. A wallet pass works offline, updates itself if the gate or time changes, and surfaces on your lock screen when you reach the airport. That removes the scramble of hunting through email or reloading an app on weak terminal wi-fi.

Four steps to a wallet pass

Finish check-in in the airline app, or open the boarding-pass email.
Tap add to wallet using the Apple Wallet or Google Wallet button shown on the pass.
Confirm it saved by opening your wallet app and checking the flight details match.
Use it offline at security and the gate, where staff scan the code without any signal.

Can I use my phone as a boarding pass? Yes. A mobile pass in the airline app or a phone wallet is scanned directly from your screen at security and at the gate. Save it to the wallet so it works offline, and still keep a printed or PDF backup in case the battery dies.

Downloading and printing

However you check in, you can usually take the pass in whichever format you prefer. To download it, finish online check-in and choose save or download, which gives you a PDF to keep offline. To print it, open that PDF or the email and print at home, or use an airport kiosk, which reprints a pass from your booking reference or a passport scan in under a minute.

On your phone: add it to the wallet after check-in for an offline, self-updating pass.
As a PDF: choose download or save, then store the file offline as a backup.
On paper at home: print the PDF or the confirmation email before you leave.
At the airport: use a kiosk or the counter to print a pass on the spot.

The check-in window

Online check-in does not stay open indefinitely. There is a window, and missing either end causes problems. It opens ahead of departure, typically a day or two before, and closes a set time before the flight, after which you must check in at the airport. Since the exact timings differ by airline, by airport, and between domestic and international services, the safe move is checking in as soon as the window opens.

The four deadlines that matter

Online check-in opens. Seat choice is widest here, so act now rather than later.
Online check-in closes. After this point, the airport counter or kiosk handles you.
Bag drop closes. Miss it and your checked bag cannot travel with you.
The gate closes. This happens before departure, and arriving late means missing the flight.

Know your deadlines before you book, because a tight connection leaves no room for a missed cut-off.

Compare flights and timings

Always verify your own timings. These are the shapes of the deadlines, not fixed rules. Every airline sets its own, and they run stricter on international flights. Confirm the specific cut-offs in the airline app, then build in a buffer, because arriving early costs nothing while arriving late costs the flight.

Domestic against international

The biggest practical difference is documents and time. On a domestic flight, check-in is usually quick and light on paperwork. On an international flight, the airline must verify your passport, any visa, and sometimes onward or entry requirements, which often happens at the counter even after you checked in online.

International trips also demand an earlier arrival, since you clear immigration and security outbound, then customs on the far side. Treat the extra verification as expected rather than as a failure of online check-in.

Plan your documents first. Before an international trip, confirm what the destination requires with our visa requirements checker. Keep the passport and any visa in your cabin bag, where you can reach them at every checkpoint, and read our airport security guide for the screening itself.

Documents and seat selection

Smooth check-in comes down to having the right documents ready before you start. At minimum that means valid identification for the route, your booking reference, and any visa the destination requires. During check-in you also handle seat selection, either confirming a seat chosen at booking or picking one now, with extra-legroom rows usually carrying a charge.

Have these four ready

Passport or identification valid for your route and your travel dates.
Booking reference so the app can pull up the trip.
Visa or entry documents wherever the destination requires them.
Payment method for seats or bags you add during check-in.

How seating works at this stage

Seat maps open to everyone at once, so the earliest check-ins take the widest choice. Families who want to sit together benefit most from checking in the moment the window opens. If your fare already includes a seat assignment, check-in simply confirms it. Our airline fare classes guide explains which fares carry free seat selection and which do not.

The boarding-day timeline

Boarding day has a rhythm, and following it removes the guesswork. Match the timings to your airline's stated deadlines and your airport's size, because the sequence is universal even where the clock is not.

Six stages, in order

The day before: check in online, confirm the seat, add the pass to your wallet.
Arrival: reach the airport early, and earlier still for international departures.
Bag drop: hand over checked luggage before the bag-drop deadline passes.
Security: pass and identification ready, with liquids and electronics out as required.
Airside: find your gate on the departure boards rather than trusting the printed one.
At the gate: board with your group, pass open and ready to scan.

How boarding groups work

Passengers rarely board all at once. Instead, airlines call groups or zones, often starting with priority boarding for premium cabins and status holders, and sometimes family boarding for those with young children. Your group is printed on the pass. Crowding the gate before your zone wins nothing, yet being ready when it is called matters, particularly if your cabin bag needs overhead space.

Watch the screens. Gates change, and a change can land after you have cleared security. Glance at the airport screens regularly and listen for announcements. The gate printed on your pass is a starting point rather than a guarantee.

When something goes wrong

Most check-in problems have a straightforward fix when you act early and talk to staff. The worst outcomes come from arriving late and hoping, because airlines enforce deadlines when one late passenger can delay an entire aircraft. Know the three common failures before they happen.

Three failures and their remedies

The online cut-off passed. Not a crisis. Check in at the counter or a kiosk instead, although you should arrive earlier to allow for the queue.
You cannot find your pass. Reprint it at a kiosk or counter, or download it again in the app, since your booking reference retrieves it.
You are running late. Go straight to a staff member. Miss the gate cut-off and you will likely be rebooked, sometimes for a fee.

When the app refuses to check you in

Sometimes online check-in will not complete at all, and the app rarely explains why. The usual causes are mundane. A passport field the route requires may sit blank, an unpaid bag or seat may still be waiting in the basket, a group or infant booking may be one the system cannot split, or a codeshare may put the record with the operating carrier instead. None of these points to a problem with your ticket.

Try the operating carrier's own app first, since a codeshare booking often checks in only there. Clear any outstanding payment, then attempt it again. Where that still fails, the counter resolves it in minutes, so leave a little extra time rather than retrying the app in the taxi.

What happens if I miss check-in? Missing online check-in is usually recoverable at the airport counter or a self-service kiosk, so long as you arrive earlier to allow time. Missing the airport check-in or bag-drop deadline is different, since you may be denied boarding and need to rebook. Confirm your cut-offs in advance either way.

Children, assistance and connections

Some journeys do not fit the standard flow, and knowing the exception in advance saves stress.

Children, medical and mobility needs

Families and travellers needing medical support often do better at the counter, where staff can arrange seating together, record infant details, and confirm that special assistance or a wheelchair is booked and expected. Request assistance in advance through the airline, then reconfirm at check-in so everything is ready when you arrive.

Connections, transit, codeshare and self-transfer

On a single through-ticket you are often checked in for connecting flights together, with a pass for each leg and bags tagged through, which helps across a layover. Transit passengers may pass a transfer security check without formally checking in again. On a codeshare, check in with the carrier actually operating the flight.

The exception is a self-transfer on separate tickets. There you check in again for each flight and re-drop the bag, so build in time. Our stopover and multi-city guides cover planning multi-leg trips in detail.

Online or at the airport?

Two questions settle this for almost every trip.

Question one: do you have only cabin baggage?

If you carry cabin bags alone, check in online and head straight for security, because the counter has nothing left to do for you. If you have bags to check, still check in online, then use bag drop when you arrive. Either way, move to question two.

Question two: is it international, or do you need checks?

When the answer is yes, allow extra time, since some verification may happen at the counter even after online check-in. When the trip is simple and domestic, online check-in plus bag drop is the fastest route, so save the pass to your wallet and go.

Four common cases

Cabin-only, simple domestic trip: online, skip the counter, straight to security.
Checked bags, otherwise simple: online, then bag drop, pass on your phone.
International with visa checks: online, then the counter, with extra time allowed.
Assistance, infants or complex routing: the counter, where staff can help directly.

Traveller scenarios

Three illustrative situations, each showing the choices in action rather than in theory.

A domestic trip, checked in from the sofa

Carrying a carry-on alone, this traveller checked in the evening before, saved the pass to a phone wallet, and next morning walked past the check-in queue straight to security. No counter, no printing and no stress, just a scan at the gate.

The lesson: for simple cabin-only trips, online check-in is almost always the fastest route.

Checked in online, still verified at the counter

Flying internationally, this traveller checked in online, yet staff asked for a counter visit so they could verify the passport and visa before the flight. Because the traveller had arrived early, the extra step stayed routine instead of becoming a rush.

The lesson: online check-in does not always skip the counter abroad, so arrive early.

The gate that moved after security

This traveller cleared security expecting one gate, then glanced at the departure screen and spotted a change to a gate in another pier. That quick check, plus a brisk walk, meant boarding on time rather than sprinting.

The lesson: confirm your gate on the airport screens even with a pass already in hand.

Check-in do's and don'ts

These habits keep boarding day smooth, and none of them costs more than a minute at home.

Do

Check in the moment the online window opens.
Save the pass to Apple Wallet or Google Wallet.
Keep an offline PDF or printed backup as well.
Arrive early, and earlier still for an international flight.
Re-check your gate on the airport screens.
Have identification, booking reference and any visa ready before you start.

Don't

Assume online check-in stays open until departure.
Rely on a single phone copy with no backup.
Trust the printed gate without checking the screens.
Cut bag-drop and security time fine on a busy day.
Ignore your boarding group once staff call it.
Leave document checks until the last minute abroad.

Myths against facts

Here are six beliefs that catch travellers out, set against what actually happens.

Common check-in myths and the reality behind each one
The myth	The reality
Online check-in is open until departure	It closes a set time before the flight, and often well before it
A mobile pass needs no backup	Phones die and signal drops, so keep a printed or PDF copy
The gate on my pass is final	Gates can change after you have cleared security
Online check-in skips the counter abroad	International routes may still verify documents in person
Missing online check-in means missing the flight	You can usually still check in at the airport, so arrive earlier
Boarding time equals departure time	Boarding starts earlier, and the gate closes before departure

The most common mistakes

Seven errors catch travellers again and again. Each is avoidable at home, which is exactly what makes them frustrating.

Assuming online check-in stays open close to departure.
Relying on one phone copy with no offline backup.
Trusting the printed gate instead of the live screens.
Arriving too late for bag drop, security or immigration.
Forgetting a passport or visa the international route requires.
Ignoring the boarding group and crowding the gate early.
Leaving seat selection so late that the family sits apart.

Related reading. These overlap with the wider errors in common flight booking mistakes. To prepare the rest of the trip, see airline baggage rules and our cabin class comparison.

The pre-departure checklist

Run this before every flight. Eight lines, two minutes, and most check-in surprises disappear.

Checked in online as soon as the window opened.
Confirmed your seat and any bags during check-in.
Saved the boarding pass to your mobile wallet.
Kept a printed or PDF backup stored offline.
Packed identification, booking reference and any visa within reach.
Planned arrival with time for bag drop, security and immigration.
Noted your boarding group and your boarding time.
Confirmed the gate on the airport screens before settling down.

The habit worth keeping

Redundancy is what separates a calm departure from a frantic one. Check in as the window opens, add the pass to your wallet, screenshot it, and keep a PDF offline. Then win the day at the other end by arriving with a buffer, since a quiet extra hour airside beats a sprint through the terminal every time.

Frequently asked questions

The basics

What is online check-in?

Online check-in is the process of confirming your seat and collecting your boarding pass through an airline's app or website before you reach the airport. The window usually opens a day or two before departure. Because it issues the pass in advance, you can skip the check-in counter and head straight to bag drop or security.

What is a boarding pass?

A boarding pass is the printed or digital document confirming you are checked in, and it permits you to pass security and board the aircraft. It shows your name, flight, seat, boarding group, gate and boarding time, alongside a scannable code that staff read at each airport checkpoint.

Can I use my phone as a boarding pass?

Yes. A mobile boarding pass in the airline app, Apple Wallet or Google Wallet is scanned directly from your screen at security and at the gate. Save it to the wallet so it works offline, and still keep a printed or PDF backup in case your battery runs out.

Can I print my boarding pass at home?

Yes. After online check-in, download the PDF or open the confirmation email and print it before you leave. A printed pass is a reliable backup, since it needs no battery and no signal. You can also print one at an airport kiosk or at the check-in counter.

Timing and deadlines

When should I check in for my flight?

Check in as soon as the online window opens, which is usually a day or two before departure, so you secure the widest seat choice and hold the pass early. Then arrive at the airport with enough time for bag drop, security and, on an international flight, immigration.

When does online check-in close?

Online check-in closes a set time before departure, after which you check in at the airport instead. The exact cut-off varies by airline and by route, and it tends to be stricter on international services. Confirm it in the airline app, then check in early rather than testing the deadline.

What happens if I miss check-in?

If you miss online check-in, you can usually still check in at the airport counter or a kiosk, so arrive earlier to allow time. If you miss the airport check-in or bag-drop deadline entirely, you may be denied boarding and need to rebook, which is why confirming cut-offs in advance matters.

Is boarding time the same as departure time?

No. Boarding starts well before departure, and the gate closes before the aircraft leaves. Go by the boarding time and the gate-closing time printed on your pass rather than the departure time, and keep watching the screens in case either the gate or the timing moves.

Baggage, seats and documents

Can I check in online without baggage?

Yes, and it is the fastest option available. With cabin baggage alone, online check-in lets you skip both the counter and bag drop, so you go straight to security with the pass on your phone. If you do have checked bags, still check in online, then drop them when you arrive.

Can I travel without printing my boarding pass?

Usually yes, since a mobile boarding pass scanned from your phone is widely accepted. However, some airports and some international routes still prefer or require a printed pass. Check what your airline says for that route, and keep a printed or PDF backup regardless.

Can I select my seat during check-in?

Yes. During online check-in you can confirm a seat chosen at booking or pick one now, with extra-legroom rows usually carrying a charge. Checking in early gives you the widest choice, because seat maps open to everyone at once and the better seats go first.

Do I need my passport to check in for an international flight?

Yes. International check-in requires a valid passport and any visa the destination needs, and the airline may verify both at the counter even after you checked in online. Have the documents ready before you start, then keep them in your cabin bag once you reach the airport.

Boarding, gates and special cases

What happens if my gate changes?

Gate changes are common, and one can land after you have cleared security. Your pass shows the original gate, so check the departure screens regularly and listen for announcements. When a gate does change, head to the new one promptly, because the boarding time rarely moves with it.

How does boarding by group work?

Airlines board in groups or zones printed on your pass, usually starting with priority boarding for premium cabins and status holders, and often family boarding for those with young children. Wait until staff call your group, yet be ready, particularly if your cabin bag needs overhead space.

Do I check in again for a connecting flight?

On a single through-ticket you are often checked in for connecting flights together, with a pass for each leg and bags tagged through. On separate self-transfer tickets you check in again for each flight and re-drop the bag, so allow extra time between the two legs.

How do I arrange special assistance or a wheelchair?

Request special assistance or a wheelchair in advance through the airline, either when booking or before you travel, then reconfirm it at check-in. Checking in at the airport counter helps here, since staff can confirm the arrangement and seating directly, so everything is ready when you arrive.

Check in with confidence, then compare your next fare

You can now move through check-in and boarding without guesswork, so compare flights and plan the next trip the same way.

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