KLM flight cancellation policy allows passengers flexibility to cancel their bookings under specific conditions. Depending on the fare type, cancellations may be eligible for a full or partial refund. For cancellations within 24 hours of booking, passengers usually receive a full refund. Non-refundable tickets may incur charges. For detailed assistance or to process your cancellation quickly, contact KLM customer support at TFN +1-844-622-0310.