The 24-hour rule for KLM means you can cancel or change your flight within 24 hours of booking without paying any extra fees+(𝟠𝟠𝟠):𝟵𝟲𝟯:1444 or +44:𝟚𝕆:8124:𝐎666. If you need help, you can contact KLM customer service+(𝟠𝟠𝟠):𝟵𝟲𝟯:1444 or +44:𝟚𝕆:8124:𝐎666. For the U.S., call, and for the U.K., call at +(𝟠𝟠𝟠):𝟵𝟲𝟯:1444 or +44:𝟚𝕆:8124:𝐎666. They are ready to assist you with any changes during this 24-hour period. This rule makes it easier for passengers to adjust their plans shortly after booking.