https://central.xero.com/s/question/0D58V00009hPWW0SAO/what-is-the-24-hour-rule-for-klm What is the 24 hour rule for KLM? The "24-hour rule" for KLM refers to their flexible booking policy [????-????????????-????????????-????????????????], which allows passengers to cancel or modify their flight reservations within 24 hours of booking without incurring any additional fees [????-????????????-????????????-????????????????]. This policy is particularly useful for customers who may need to make changes shortly after booking their tickets [????-????????????-????????????-????????????????].