How to check in online for a flight (2026)
Quick Answer
To check in online for a flight, go to your airline’s website or app during the airline’s check-in window, enter your booking details, confirm passenger and travel document information, choose or confirm seats and bags, then download or print your boarding pass if the route allows it. You know it is done properly when the airline shows your status as checked in and issues a valid boarding pass or clear instructions to collect one at the airport.
Overview
Online check-in lets you confirm you will be travelling, review your booking, and often get your boarding pass before you reach the airport. In most cases, the process starts on the airline’s own website or mobile app, not a third-party booking site. You usually need your booking reference or ticket number, your surname, and for some international trips your passport details and any destination-specific travel information the airline asks for. During check-in, the airline may ask you to accept seat allocation, pay for extras such as bags or seat selection, and confirm dangerous goods and baggage declarations. The exact screens vary by airline, but the correct order is broadly the same: open the booking, confirm travellers, review documents, choose seats and bags, complete check-in, then save the boarding pass. For some routes, especially international journeys, online check-in may complete only partly and the airline may still require document checks at the airport. That is normal. The main signs of success are a confirmation message, a boarding pass with your name and flight details, or a notice telling you exactly what remains to be checked at the airport. Always use the airline’s official channel and re-check the latest baggage, document and airport timing rules before you travel.
Who this is for
Passengers who have a confirmed airline booking and want to complete check-in before arriving at the airport, whether travelling with cabin baggage only or with hold luggage.
What you’ll need
- Your airline booking reference, e-ticket number or frequent flyer login
- The passenger’s surname exactly as booked
- A smartphone, tablet or computer with internet access
- Travel documents required for your journey, such as passport and any destination entry documents the airline asks to review
- Payment method if you may need to pay for bags, seats or other extras
- A way to save or print the boarding pass if offered
Before you start
Check that your flight is eligible for online check-in and that the check-in window has opened on the airline’s official website or app. Make sure the name on the booking matches the traveller’s document, confirm any visa or entry requirements for the destination, and decide whether you need hold baggage, seat changes or special assistance so you can deal with them during check-in.
Step-by-step
- 1
Open the airline’s official check-in page or app
Go to the airline’s own website or mobile app and look for 'Check in' or 'Manage booking'. Enter the booking reference or ticket number and the passenger’s surname, or sign in if your booking is linked to your account.
Why: Using the airline directly reduces the risk of stale booking information, fake websites or missing airline-specific check-in options.
- 2
Find the correct flight and passengers
Check the route, date, flight number and names shown on screen. If there is more than one traveller, select who is checking in now. Do not continue if key details are wrong; fix them with the airline first.
Why: Check-in applies to a specific flight and person. Confirming the correct booking avoids boarding pass errors and airport delays.
- 3
Confirm travel document and contact details
Review or enter the details the airline requests, such as passport information, nationality, date of birth, destination contact information or emergency contact details. Answer any required travel, security or dangerous goods declarations honestly.
Why: Airlines must verify that passenger and document details are complete enough for travel and destination compliance before issuing or validating a boarding pass.
- 4
Choose or confirm seats and baggage
Accept the seat already assigned or choose another if the airline offers that option. Add hold baggage if needed, and review any charges before paying. If you only have cabin baggage, check the airline’s latest size and item rules.
Why: Seat and baggage choices can affect cost, airport queueing and whether you need to visit a bag-drop desk before security.
- 5
Review the summary and complete check-in
Read the final summary carefully, then complete check-in. Wait for the confirmation screen rather than closing the page early. If payment is needed for extras, make sure you see a success message.
Why: This is the point where the airline records you as checked in. Leaving too early can mean the process was not actually completed.
- 6
Save, print or add the boarding pass to your phone
Download the boarding pass, add it to your phone wallet if supported, email it to yourself, or print it if you prefer or if the airport or airline advises a paper copy. If the airline says your boarding pass cannot be issued online, note the instruction to collect it at the airport.
Why: You need accessible proof of check-in to pass through airport checkpoints and to board, unless the airline specifically requires airport document verification first.
- 7
Check what you still need to do at the airport
Read any post-check-in instructions. If you have hold luggage, look for the airline’s bag-drop rules. If your documents still need checking, go to the staffed desk in good time. Keep checking the airline app for gate changes or schedule updates.
Why: Online check-in does not always remove the need to visit a desk, especially for bag drop, special assistance or international document checks.
Why this works
Online check-in works because it lets the airline confirm your intention to travel, capture required passenger data, assign operational details such as seats, and issue a boarding pass or pre-clearance status before you arrive at the airport.
Common mistakes to avoid
- Trying to check in on an online travel agent site instead of the airline’s own site or app
- Entering a nickname or surname spelling that does not match the booking
- Assuming online check-in means you do not need to visit bag drop or a document check desk
- Not downloading the boarding pass after check-in
- Waiting until the last moment, then missing the check-in deadline or finding the app overloaded
Troubleshooting
The website says check-in is not available yet
Check the airline’s stated check-in opening time for your route and try again later. Some flights, airports or fare types have different online check-in windows.
The system cannot find the booking
Re-enter the booking reference and surname exactly as shown on the ticket. If you booked through an agent, use the airline booking reference rather than the agent itinerary number if they are different.
You checked in but no boarding pass is issued
Read the airline message carefully. You may need airport document verification, visa checks, or a manual seat assignment. Follow the instruction to collect the boarding pass at the airport.
Passport or travel document details are rejected
Check that every character, number and expiry date matches the document exactly. If it still fails, contact the airline or complete the document check at the airport.
Payment for bags or seats fails
Confirm the card details, try another payment method if available, or continue without the extra and arrange it later through manage booking or at the airport if the airline permits.
The mobile boarding pass will not load at the airport
Save it to your device in advance, take a screenshot if permitted, email yourself a copy, or use a printed version if available.
Compare your options
Airline mobile app
Best for: Most travellers who want live updates and easy access to a boarding pass
Pros: Convenient, usually the fastest option, can store boarding passes and send notifications
Cons: Needs a charged phone and compatible device; mobile passes are not accepted on every route
Airline website on a computer or phone browser
Best for: Travellers who prefer a larger screen or want to print documents
Pros: Works without installing an app, often easier for entering passport details, simple to print
Cons: Less convenient at the airport if you do not save the boarding pass properly
Airport self-service kiosk or check-in desk
Best for: Passengers who cannot complete online check-in or need document checks
Pros: Helpful for problem bookings, document verification and bag drop questions
Cons: Usually slower and may involve queues; less control over timing and seat choice
| Option | Best for | Pros | Cons |
|---|---|---|---|
| Airline mobile app | Most travellers who want live updates and easy access to a boarding pass | Convenient, usually the fastest option, can store boarding passes and send notifications | Needs a charged phone and compatible device; mobile passes are not accepted on every route |
| Airline website on a computer or phone browser | Travellers who prefer a larger screen or want to print documents | Works without installing an app, often easier for entering passport details, simple to print | Less convenient at the airport if you do not save the boarding pass properly |
| Airport self-service kiosk or check-in desk | Passengers who cannot complete online check-in or need document checks | Helpful for problem bookings, document verification and bag drop questions | Usually slower and may involve queues; less control over timing and seat choice |
Alternatives
- Use the airline’s self-service kiosk at the airport
- Check in with a staffed airline desk if online check-in is blocked or documents need manual review
Pro tips
- Set a reminder for when your airline’s check-in window opens, especially if you want better seat choices
- Use the airline app after check-in for gate changes and delay alerts
- If travelling internationally, keep your passport beside you before you start rather than guessing details from memory
- If you are travelling with others on one booking, confirm whether everyone wants to check in at the same time
- Save the boarding pass in more than one way if possible, such as app, email and print
Safety notes
- Use only the airline’s official website or app to avoid phishing and fake check-in pages
- Do not share booking references or boarding pass barcodes publicly, as they contain personal travel information
- Keep your phone charged if relying on a mobile boarding pass
- Answer safety and dangerous goods questions truthfully; false declarations can lead to denied boarding or penalties
Legal & regulatory notes
You are responsible for meeting the airline’s conditions of carriage and the destination’s passport, visa and entry rules, even if online check-in appears to succeed. Airlines may refuse boarding if your documents, baggage or declarations do not comply.
What this guide does not cover: This guide explains the general online check-in process and does not cover one specific airline’s screens, every country’s entry rules, or special cases such as unaccompanied minors, complex group bookings or all visa situations.
Cost considerations
Online check-in itself is usually included, but optional seat selection, hold baggage and some airport services may cost extra depending on the airline and fare. Checking in online can help you avoid some airport service charges where an airline imposes them, but you should confirm the current policy on the airline’s official site.
Frequently asked questions
How do I know online check-in worked?+
You should see a clear confirmation that you are checked in, and usually receive a boarding pass or a message explaining any remaining airport document check. Your booking in the airline app or website should show a checked-in status.
Can I check in online if I have hold luggage?+
Yes, in many cases. You still normally need to take the bag to the airline’s bag-drop or check-in desk at the airport within the airline’s deadline.
Why is the airline making me collect my boarding pass at the airport?+
This often happens when the airline needs to check passports, visas or other travel documents in person, or when mobile boarding passes are not supported for that route or airport.
Can I use a screenshot of my boarding pass?+
Sometimes, but it is safer to keep the original boarding pass in the airline app, mobile wallet, PDF or print form because some airports or airlines require a live or scannable version.
What if I miss online check-in?+
You may still be able to check in at the airport if you arrive before the airline’s check-in deadline, but you should check the airline’s policy because some carriers limit airport check-in or charge for it.
Sources & references
Guidance on this page is traced to documented sources. Last checked 24 September 2026.
- UK Civil Aviation Authority - At the airport · government
Supports practical airport process points, including arriving prepared, check-in, bag drop and security-related passenger information.
The basic process changes slowly, but check-in windows, document checks, mobile pass acceptance and airline policies can change by route, airport and fare.