According to Lufthansa cancel within 24 hours, you can cancel your reservations with this airline. You may do this within twenty-four hours, or on the same day as the reservation. When you cancel your flight with Lufthansa within 24 hours, you can also get a refund. Up to 24 hours after making the first booking, clients may cancel their flight reservations and receive a full refund without incurring any fees. Please send your request over the web.