Your flight number appears on your airline confirmation email, your boarding pass, and the airline's website under your reservation

The flight number is a two- to four-character code — usually a letter or two followed by numbers, like AA 1247 or SW 502 — that identifies the specific route and departure time your airline is operating. It is not the same as your booking reference (the six-character code the airline uses to pull up your reservation). You need the flight number to track delays, check in online, and find real-time status updates.

If you booked through the airline directly, check your confirmation email first. The flight number sits near the top, alongside the departure date and time. If you booked through a travel site like Kayak, Expedia, or Google Flights, log back into that site, find your booking, and the flight number will be listed there. You can also log into the airline's website or app, enter your booking reference and last name, and pull up your reservation — the flight number appears on that screen.

Key Takeaways

  • Your flight number is a two- to four-character code (like AA 1247) printed on your boarding pass and confirmation email, separate from your booking reference.
  • Check your airline confirmation email first — the flight number appears near the departure date and time.
  • If you booked through a travel site, log back in and find your booking; the flight number is listed there.
  • The airline's website or app will show your flight number when you enter your booking reference and last name.
  • Once you have the flight number, you can track real-time delays and status on the airline's website, FlightAware, or FlightRadar24.

How to find it on your boarding pass

Your boarding pass — whether printed, on your phone, or at the airport counter — displays the flight number prominently near the top. On a printed pass, it is usually in the upper left or right corner, next to the airline logo. On a mobile boarding pass in your phone's wallet or airline app, swipe to the details view; the flight number appears alongside your seat assignment and gate information.

If you have not yet printed or downloaded your boarding pass, you can still retrieve the flight number from your confirmation email or the airline's website. Most airlines let you check in online 24 hours before departure, and the boarding pass you generate at that time will show the flight number.

Finding it in your confirmation email

Open the confirmation email the airline sent when you booked. The flight number is usually listed in a section labeled "Flight Details" or "Itinerary." It appears next to the departure date, departure time, and destination airport code. If you have multiple flights in one booking (a connection, for example), each flight will have its own number.

If you cannot find the email, search your inbox for the airline name or your booking reference. If the email is truly gone, you can still retrieve the flight number by logging into the airline's website with your booking reference and last name, or by calling the airline's customer service line.

Using the airline's website or app

Go to the airline's official website or open their mobile app. Look for a "Manage My Booking," "Check My Reservation," or "My Trips" section. Enter your booking reference (the six-character code from your confirmation email) and your last name. The system will pull up your reservation and display all flight details, including the flight number, departure time, aircraft type, and gate (once assigned).

The airline app is often faster because it may save your booking automatically. If you have already checked in, the app will show your boarding pass with the flight number displayed prominently.

What to do if you booked through a travel site

If you purchased your ticket through Expedia, Kayak, Google Flights, Costco Travel, or another third-party booking site, log back into that site using your account email and password. Find your upcoming trips or bookings section and select the flight. The flight number will be listed in the itinerary details. Some travel sites also send a separate confirmation email from the airline itself; check both your travel site account and your email inbox.

You can also go directly to the airline's website and enter your booking reference there. The airline's system will recognize the booking regardless of where you purchased it, and you will see the flight number on your reservation page.

Tracking your flight once you have the number

Once you have the flight number, you can track real-time delays and status on several free sites. The airline's own website is the most reliable source — enter your flight number and departure date, and you will see the current status, any delays, and the estimated arrival time. FlightAware and FlightRadar24 are independent tracking sites that show live aircraft position, altitude, and speed; they are useful if the airline's site is slow or if you want to see where the plane is in the air.

You can also set up alerts on the airline's app or website so you receive notifications if your flight is delayed, cancelled, or if your gate changes. This is especially helpful during weather events or when multiple flights are affected at once.

Flight number vs. booking reference: what is the difference

Your booking reference is a six-character code (like 3X9K2L) that the airline uses to look up your entire reservation — your name, seat, baggage allowance, and all flights in your itinerary. Your flight number is the two- to four-character code (like UA 456) that identifies the specific flight you are on. You need the booking reference to manage your reservation; you need the flight number to track delays and find your gate at the airport.

When you call the airline or check in online, you will use your booking reference. When you want to know if your flight is delayed or which gate it is leaving from, you will use the flight number. Both appear on your boarding pass and confirmation email, but they serve different purposes.

Frequently Asked Questions

Is the flight number the same as the confirmation number?

No. Your confirmation number (or booking reference) is a six-character code the airline uses to pull up your entire reservation. The flight number is the two- to four-character code that identifies the specific flight. Both appear on your boarding pass, but they are different.

Can I find my flight number if I lost my booking confirmation?

Yes. Log into the airline's website or app and enter your booking reference and last name. If you do not have your booking reference, call the airline's customer service line with your name and travel date, and they can look it up for you.

What if my flight number changes?

Airlines occasionally reassign flight numbers due to schedule changes or aircraft swaps. If this happens, the airline will send you an email notification. Check your email and the airline's website to confirm the new flight number before you head to the airport.

Do I need the flight number to check in online?

No. You check in using your booking reference and last name. The flight number is generated once you check in and appears on your boarding pass. You do not need it to start the check-in process.

Where do I find the flight number if I booked a round trip?

Each flight in your itinerary has its own flight number. Your outbound flight and return flight will have different numbers. Both appear on your confirmation email and boarding passes, listed separately under each leg of your trip.