Delta Airlines establishes a 24-hour cancellation policy after paying attention to the wants and demands of its customers. When organising reservations, it gives travellers more freedom and advantages. Within 24 hours of the purchase, passengers may cancel a flight booked on Delta Airlines in accordance with the airline&039;s 24-hour cancellation policy. If the reservation was made a week or more before the scheduled departure date of the flight, the airline will give a full refund of the ticket fee.