Are you willing to cancel your Delta flight and want to know your refund eligibility? How to cancel Delta flight in a way that one gets a full refund is a question for many of us. To answer this question Delta Airlines has applied a 24 hours rule on every type of ticket. If a passenger cancels their ticket within 24 hours of booking then that ticket gets refunded in full. No cancellation fees or additional fees are applied. Bookings can be canceled through the website as well as via customer helpline call.