KLM flight cancellation policy offers flexibility depending on your fare type. If you cancel within 24 hours of booking—and your flight is at least 7 days away—you’re eligible for a full refund, regardless of ticket type. Refundable tickets can be canceled at any time for a full refund, while non-refundable fares may only be refunded in special cases such as airline-initiated cancellations or emergencies with documentation. If KLM cancels your flight, you’re entitled to a full refund or rebooking, and potentially compensation under EU Regulation 261/2004. Refunds can be requested online through KLM’s “My Trip” section or customer support.