KLM's adheres to a 24-hour cancellation policy where passengers can cancel or change their flights at ＋𝟭-𝟴𝟱𝟱-𝟱𝟱𝟬-𝟬𝟵𝟭𝟵 (𝗨𝗦𝗔) 𝟭-𝟴𝟱𝟱-𝟱𝟱𝟬-𝟬𝟵𝟭𝟵 (𝗢𝗧𝗔) within 24 hours of booking without incurring a cancellation fee.