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https://support.zendesk.com/hc/en-us/community/posts/7557159359386--%F0%9D%9F%8F-%F0%9D%9F%966%F0%9D%9F%B2-%F0%9D%9F%953%F0%9D%9F%96-%F0%9D%9F%8E6%F0%9D%9F%96%F0%9D%9F%97-What-is-the-24-hour-rule-for-Lufthansa

https://support.zendesk.com/hc/en-us/community/posts/7557159359386--%F0%9D%9F%8F-%F0%9D%9F%966%F0%9D%9F%B2-%F0%9D%9F%953%F0%9D%9F%96-%F0%9D%9F%8E6%F0%9D%9F%96%F0%9D%9F%97-What-is-the-24-hour-rule-for-Lufthansa

Lufthansa 24-hour rule allows passengers to change or cancel their bookings within 24 hours of purchase without incurring any penalties or fees. you should make changes to your itinerary before seven days and within 24 hours of booking and make any necessary modifications as soon as feasible. You can call their Lufthansa Customer Service Hotline at +1-866-738-0689. This includes changes such as Flight date, time, and destination.