Not sure of the reason? Search your flight number on Google or FlightRadar24.com to check, then select it here.
No compensation applies if the reason was truly outside the airline's control (called 'force majeure') — this includes weather, air traffic control, security risks, strikes, political instability, natural disaster, civil war, riot, flood, explosion, or government order. If you select 'Other' and we're not sure it counts, we'll tell you plainly instead of guessing.