What is the method of applying for a refund after cancelling a flight reservation with Lufthansa Airlines? The entire section of Lufthansa cancelled flights is deemed refundable if the flights are cancelled within 24 hours of purchase no matter what the ticket type is and under what terms the booking was made. To apply for a ticket refund, travelers have to fill out a refund application form after cancelling the reservation. The unused portion of the ticket gets refunded and is inclusive of tax amount.