Departure delay
How late your flight leaves compared with the scheduled departure time.
Airdelay Help Guide
When checking flight compensation, the most important delay is usually not how late your flight left the gate. It is how late you arrived at your final destination.

Quick answer: for many flight compensation rules, a delay is measured by the time you arrive at your final destination, not only by how late your flight departed. A flight can leave late but still arrive less than 3 hours late, or leave almost on time but arrive much later because of problems during the journey.
Departure delay is the delay at the start of your journey. It usually means your flight left later than the scheduled departure time shown on your booking, boarding pass, airline app, or airport screen.
Departure delay is still important because it can affect your right to care at the airport, such as meals, refreshments, communication, or hotel accommodation when required. But for compensation, departure delay alone is not always enough.
Arrival delay is the delay when you reach your destination. In compensation cases, this usually means how late you arrived at your final destination compared with the scheduled arrival time.
This matters because passenger-rights rules such as EU261 and UK261 often look at the delay at the final destination. If you arrived 3 hours or more late and the airline was responsible for the disruption, you may be eligible for compensation.
How late your flight leaves compared with the scheduled departure time.
How late you reach your final destination compared with the scheduled arrival time.
Large departure delay, but arrival delay is under 3 hours.
Compensation may not apply if the final arrival delay is below the required threshold.
Smaller departure delay, but arrival delay is over 3 hours.
This may support a compensation claim if the airline was responsible.
The key question is often when you arrived at the final destination.
Missed connection claims can depend on final destination arrival time and whether the flights were on one booking.
Your final destination is the last airport on the journey covered by your booking. For a direct flight, this is simple: it is your arrival airport. For a connecting journey, it is usually the last airport on the same booking.
For example, if your route was Paris → Amsterdam → Istanbul on one booking, the important delay may be your arrival time in Istanbul, not only the delay at Amsterdam.
You may be eligible for compensation when these points apply:
A long departure delay does not automatically mean compensation is owed. Your claim may be weaker if:
If your flight was delayed, save anything that helps show your journey and timing:
Your flight departs 3 hours 30 minutes late but lands 2 hours 55 minutes late. Compensation may not apply because the arrival delay is under 3 hours.
Your flight departs 45 minutes late but arrives 3 hours 15 minutes late because of airline operational problems. You may have a claim.
Your first flight delay makes you miss a connection on the same booking, and you reach your final destination 5 hours late. This may be important for eligibility.
Passenger-rights rules can depend on route, airline, country, and the cause of the delay. These official resources can help you understand the general rules:
Tell us your route, airline, travel date, and what happened. Airdelay can help you check whether your arrival delay may qualify for compensation.