What is the 24 hour rule for KLM? https://support.xilinx.com/s/question/0D54U00008ahBoNSAU/klmflywhat-is-the-24-hour-rule-for-klmget-instant-help24x7?language=en_US KLM follows the 24-hour rule, which allows passengers to make changes to their bookings or cancel their Flights within 24 hours of purchase without incurring any penalty fees, +１=８３３=４６０=１８３８ (USA) or +１=８３３=４６０=１８３８ (For UK). #klmcustomerservice, #klm24hour