KLM Airlines allows refunds to all its travelers after they cancel their flight. However, there are some important cases where the refund is allowed. There are several instances where passengers can request a refund such as for unused flight or cancelling within 24 hours of booking flight tickets Airlines cancellation policy helps the travelers to cancel their flight in case, they come across any emergency. Cancellation policy is specially listed on the website where the passengers can go through the circumstances in which they can easily cancel their flight.