Your flight number appears on your confirmation email and boarding pass
Your flight number is a combination of letters and numbers — usually two letters followed by one to four digits — that identifies your specific flight. It appears on your airline confirmation email the moment you book, on your boarding pass when you check in, and on the airline's website under your reservation.
If you booked through an airline directly, check the confirmation email that arrived after payment. If you booked through a travel site like Expedia, Kayak, or Google Flights, the confirmation email from that site will show the flight number. The email subject line often says "Booking Confirmation" or "Your Itinerary", and the flight number is listed near the departure time and airport codes.
Once you arrive at the airport or check in online, your boarding pass displays the flight number prominently — usually in large print near the top. If you lose your boarding pass, you can reprint it at the airport kiosk or retrieve it through the airline's mobile app.
Key Takeaways
- Your confirmation email from the airline or booking site contains your flight number when ready after you purchase your ticket.
- Your boarding pass — whether printed or digital on your phone — shows the flight number in large text near the departure time.
- The airline's website or mobile app lets you look up your flight number by entering your confirmation code and last name.
- Flight numbers are always two letters (the airline code) plus one to four numbers, such as AA 1234 or UA 42.
Finding your flight number on the airline website
Every major airline has a "Manage My Booking" or "Check My Reservation" section on its website. Go to the airline's homepage, look for a link that says "Manage Booking", "My Trips", or "Check Flight Status", and enter your confirmation code (a six-character alphanumeric code from your email) and your last name.
The airline will display your full itinerary, including the flight number, departure time, gate (if assigned), and current status. This method works whether you booked directly with the airline or through a third-party site, as long as you have your confirmation code. If you cannot find your confirmation code, check your email for the original booking confirmation — it is always included there.
Using the airline's mobile app
Most airlines offer free mobile apps (American Airlines, Delta, United, Southwest, and others all have them) that let you add your reservation by entering your confirmation code. Once added, the app shows your flight number, seat assignment, boarding time, and real-time status updates.
The app also sends push notifications if your flight is delayed, cancelled, or if your gate changes. This is often faster than checking the website, especially at the airport. You can also use the app to check in online 24 hours before departure, and your digital boarding pass will display the flight number.
Finding the flight number on third-party booking sites
If you booked through Expedia, Kayak, Google Flights, Costco Travel, or another travel booking site, your confirmation email from that site shows the flight number. The email will also include a link to view your itinerary on that site's platform.
Log into your account on the booking site and look for "My Trips" or "My Reservations". Your flight details, including the flight number, will appear there. Some booking sites also send the airline's confirmation email separately, so check both your inbox and spam folder if you are looking for the original airline confirmation.
What to do if you cannot locate your flight number
If your confirmation email is missing or you cannot access the airline website, call the airline's customer service line. You will need your name, departure date, and destination airport. The representative can pull up your reservation and provide the flight number over the phone.
You can also arrive at the airport early and ask at the airline's ticket counter. They will look up your reservation by name and date and provide the flight number, or they can print a new boarding pass if you have already checked in online.
Understanding flight number formats
Flight numbers always follow the same pattern: two letters representing the airline code, followed by one to four digits. American Airlines flights start with AA, Delta with DL, United with UA, Southwest with WN, and so on. The number portion identifies the specific route and departure time.
Some airlines use the same flight number for the same route every day (for example, Delta 100 might always be the morning flight from Atlanta to New York). Other airlines assign different numbers to the same route at different times. This is why the flight number alone is not enough to identify your flight — you also need the date and departure time.
Why you need your flight number for delays and cancellations
When your flight is delayed or cancelled, the airline communicates updates using the flight number. Checking the airline's website or app by flight number shows you the current status, new departure time (if delayed), and whether the flight has been cancelled or rebooked.
If you are at the airport, the departure boards display flight numbers alongside gates and status. If you are at home, searching for your flight number on the airline's website or FlightAware (a free flight tracking site) gives you real-time information without having to call customer service.
Frequently Asked Questions
Can I find my flight number if I only have my confirmation code?
Yes. Go to the airline's website, click "Manage My Booking" or "Check My Reservation", and enter your confirmation code and last name. The airline will display your full itinerary, including the flight number.
Is the flight number the same as my booking reference?
No. Your booking reference (or confirmation code) is a six-character code that identifies your reservation. Your flight number is the airline and number that identifies the actual flight you are on. You need both to manage your booking.
What if I booked a connecting flight — do I get one flight number or two?
You get two flight numbers — one for each leg of the journey. Your confirmation email and boarding pass will show both. Each flight has its own number, departure time, and gate assignment.
Can I look up a flight number without a confirmation code?
Most airline websites require a confirmation code. However, you can call the airline's customer service line with your name, departure date, and destination, and they will provide the flight number. You can also ask at the airport ticket counter.
Does the flight number change if my flight is delayed or cancelled?
No. The flight number stays the same even if the departure time changes. If your flight is cancelled and you are rebooked on a different flight, you will receive a new flight number for the replacement flight.