What Is a Flight Number and How Do You Read It?
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A flight number is the unique identifier for a specific air service. It consists of two elements:
- Airline code (2 letters, or a letter + number) — assigned by IATA (the International Air Transport Association).
- Route number (1–4 digits) — the number assigned to that specific route.
Examples:
| Flight number | Airline code | Airline | Route number |
|---|---|---|---|
| FR1234 | FR | Ryanair | 1234 |
| W61234 | W6 | Wizz Air | 1234 |
| LH1346 | LH | Lufthansa | 1346 |
| BA123 | BA | British Airways | 123 |
| U21234 | U2 | easyJet | 1234 |
Important nuances:
- One physical aircraft can carry multiple flight numbers simultaneously. This is called a code-share — for example, a flight operated by Lufthansa (LH400) may also be sold as United Airlines (UA901). Same aircraft, same passengers, two flight numbers.
- The flight number changes at each connection. Frankfurt–New York (LH400) and New York–Frankfurt (LH401) are different numbers even if booked as a single itinerary.
- The same flight number is used every day on the same route. LH400 is always the Frankfurt–New York service. Date + flight number = one unique journey.
Where to Find Your Flight Number — Ticket, Boarding Pass, App, Email
Your flight number appears in several places:
On your booking confirmation (email): After purchasing, you receive a confirmation email. The flight number is listed in the "Flight details" section — usually next to the departure time and route.
On your boarding pass: The most visible location. The flight number is printed in large type — e.g. "FR 8732." On an electronic boarding pass (in an app) — equally prominent.
In the airline's app: Go to "My Flights" or "My Bookings." The flight number is shown for each leg of your journey.
On the airport departures board: The board displays flight number, departure time, gate, and status. This is the fastest way to check the current status once you're at the airport.
In Google search: Type the flight number (e.g. "LH400") directly into Google. A card will appear showing the current flight status, scheduled and estimated times, terminal and gate.
What not to confuse with a flight number:
- Booking reference (PNR) — a 6-character alphanumeric code (e.g. AB3C4D). Identifies your reservation, not the flight.
- Ticket number — a 13-digit number identifying your ticket in the airline's billing system.
- Seat number — e.g. 14A. Identifies your assigned seat on the aircraft.
How to Track a Flight in Real Time
Live flight tracking is useful in many situations: when you're meeting someone at the airport, checking whether your own flight is delayed, or simply watching an aircraft's progress.
Flightradar24 (app and website) The world's most popular flight tracking service. Shows the aircraft's position on a live map (with a few-second delay). Enter a flight number to see the route, altitude, speed, aircraft type, and estimated arrival time.
FlightAware A strong alternative to Flightradar24. Better historical data — you can check whether a given flight number is regularly delayed. Useful for planning connections.
The airline's app Ryanair, Wizz Air, Lufthansa, British Airways, and other carriers have mobile apps with live flight tracking. You'll receive push notifications about gate changes, delays, and cancellations.
Google Fastest method: type the flight number into the search bar. Google displays a card with basic information: scheduled and actual times, current status, terminal, and gate.
| Tool | Real-time data | Historical data | Alerts | Cost |
|---|---|---|---|---|
| Flightradar24 | Yes (seconds delay) | Limited in free version | Yes (paid) | Free / from €1.49/month |
| FlightAware | Yes | Yes (up to 4 months back) | Yes | Free / premium |
| Airline app | Yes | No | Yes (push) | Free |
| Yes | No | No | Free |
Flight Number, Delays, and What It Means for Your Rights
When your flight is delayed, the flight number becomes a critical piece of information — both at the airport and when pursuing compensation later.
How to check whether a flight is delayed:
- Go to Flightradar24 or FlightAware and enter the flight number.
- Compare the scheduled arrival time with the current estimated arrival.
- The difference is your delay.
Why this matters for your rights:
EU Regulation EC 261/2004 entitles you to compensation if your flight arrives at its destination 3 hours or more late (measured at arrival, not departure). Crucially, what counts is the actual arrival time — the moment the aircraft doors open at the destination airport.
| Arrival delay | Your rights |
|---|---|
| Under 2 hours | No compensation right; airline should provide information |
| 2–3 hours | Right to meals and drinks; compensation depends on distance |
| 3+ hours | Right to compensation: €250–600 (depending on distance) |
| 5+ hours | Right to abandon the journey and receive a full ticket refund |
Exception: the airline does not owe compensation if the delay is caused by "extraordinary circumstances" — for example, an air traffic control strike, extreme weather, or a security threat. However, a technical fault with the aircraft is not an extraordinary circumstance — airlines are responsible for the airworthiness of their fleet.
When You Need Your Flight Number for a Compensation Claim
If your flight is delayed by 3+ hours, note down the flight number. It's the first thing AirHelp or any claims service needs to assess your case.
What you'll need:
- Flight number (e.g. FR8732)
- Date of the flight
- Departure and arrival airports
- Actual arrival time (from Flightradar24 or FlightAware)
- Boarding pass or booking confirmation
How to use it:
- Go to the airline's website and file a complaint — provide the flight number and date.
- Alternatively, use a service like AirHelp, which automatically checks eligibility based on your flight number. Just enter the number and date — the system compares your data against delay databases. AirHelp has helped over 10 million passengers, achieving a 93% success rate. You pay only if you win — 35% commission on the recovered amount.
Tip: even if the flight was some time ago, you may still be able to claim. Across EU member states, limitation periods for flight compensation claims range from 1 year (some countries) to up to 6 years (others). If you have an old flight number and suspect the flight was delayed — check it on FlightAware, which stores historical data.
FAQ
1. Does the flight number change if the flight is delayed?
No — the flight number stays the same regardless of any delay. The gate, terminal, or even destination airport can change (in the case of a diversion), but the flight number is fixed for that date and route.
2. What is a code-share and why does my flight have two numbers?
A code-share is an agreement between airlines whereby a flight operated by one carrier is sold under the numbers of both. For example, a Lufthansa flight (LH400) from Frankfurt to New York may also be sold as United Airlines (UA901). You're on the same aircraft, but the number on your boarding pass depends on which airline you booked with.
3. How do I find my flight number if I've lost my confirmation?
Search your email (try the airline name or "booking confirmation"). Log in to the airline's app. If you know the date and route, search for the historical flight on Flightradar24. You can also call the airline with your booking reference (PNR) or personal details.
4. Do I need my flight number for online check-in?
Not directly — for online check-in you need your booking reference (PNR) or your surname and email address. The flight number is displayed during check-in, but you don't need to enter it yourself.
5. Why does the same flight number sometimes have different times on different dates?
This happens when airlines adjust their schedule seasonally. The same flight number might depart at 10:00 in summer and 11:30 in winter. Always check the time for your specific date rather than assuming it's always the same.
6. Can I check the delay history of a specific flight number?
Yes — FlightAware and Flightradar24 (paid version) store historical data. You can see how often a given flight number has been delayed in recent months. This is useful both for planning trips and for supporting a compensation claim — it confirms that the flight was indeed delayed.
What if your flight is delayed?
Even the best-planned trip can be disrupted by a flight delay or cancellation. Under EU Regulation EC 261/2004, you may be entitled to up to €600 per person in compensation. Use our compensation calculator to check your claim in minutes, or read our complete guide to EC 261/2004 to understand your rights.