If you want a free cancellation, then cancel your flight tickets within 24 hours of booking, and you will get a full refund from the airline.If you have changed your plans at the last moment, you will be charged some fees for canceling flight tickets that may be deducted from the refund.You will not be allowed to cancel flight tickets that are expired, non-refundable, or used.You can cancel your flight tickets only within 24 hours of the scheduled flight time.