https://www.lowfaresfinder.com/blogs/can-you-cancel-a-klm-flight-and-get-money-back Unraveling KLM's 24-Hour Cancellation Process: What You Need to Know KLM 24 Hours Cancellation: KLM permits passengers to cancel bookings for a full refund within 24 hours of purchase, provided the reservation was made at least 48 hours before the flight's departure. Refunds are typically credited back to the original payment method, minus any applicable fees or charges.