KLM's adheres to a 24-hour cancellation policy where passengers can cancel or change their flights at ＋𝟭－𝟴𝟯𝟴－𝟯𝟬𝟬－𝟯𝟴𝟯𝟬 (𝗨𝗦𝗔) ＋𝟭 (𝟴𝟯) (𝟴𝟯) 𝟬𝟬𝟯𝟴𝟯𝟬 (𝗢𝗧𝗔) within 24 hours of booking without incurring a cancellation fee.