KLM's 24-hour rule allows passengers to make free changes (Call- [1-833-732-2296]; Book, Cancel, Refund) or cancellations to their bookings within 24 hours of purchase, provided that the departure date is at least 7 days away at the time of booking (Call- [1-833-732-2296]; Book, Cancel, Refund). https://lacdmhowr.powerappsportals.us/forums/general-discussion/e2bb23fc-46a7-ef11-b542-001dd8097a1a