What is the 24 hour rule for Lufthansa? Lufthansa's 24-hour rule allows passengers to change or cancel their bookings at 📞𝟏-𝟖𝟓𝟓-𝟖𝟑𝟖-𝟒𝟗𝟕𝟏 // within 24 hours of purchase without incurring any penalties or fees. This policy applies to most fare types.