How to claim compensation for a cancelled or delayed flight

Compensation is dependent on the reason for the delay. If the delay was caused by 'extraordinary circumstances', then no compensation is due. Extraordinary circumstances include severe weather, security risk or political risk.
In this instance, you are still entitled to meals, refreshments and accommodation; depending on the length of delay and distance of your flight (see below).
How to claim compensation if your flight delayed
According to the Denied Boarding Regulation, your entitlements depend on the length of your flight and the delay.
For example, if your flight distance is less than 932 miles (1,500 kilometres) and is delayed for over three hours, then you may be able to claim up to £200. If the flight is delayed for more than five hours, you have the option to withdraw from your flight and claim for a full refund. Please click here for more information.
How to claim compensation if your flight is cancelled?
In the event of a cancelled flight, airlines are obliged to either reimburse or reroute passengers on the next available flight, or on an agreed date.
If you're offered re-routing on a flight that leaves less than an hour before the original flight and is due to arrive at your destination less than two hours later than the original flight, then you're not entitled to compensation.
If the flight offered fails to fall within these time frames, or you're offered no alternative flight, then you can claim compensation. Again, if the airline can prove the delay was due to 'extraordinary circumstances', then you are not entitled to compensation.
While this can seem like a minefield, as long as you are aware of your rights then you will know whether you are entitled to compensation or not.