Southwest Airlines Cancellation Policy and Refunds 24-???? ???????????? ??????: Southwest Airline offers a 24-hour grace period where you can cancel your booking for a full refund if the reservation was made at least 2 days (48 hours) before departure. This applies to both refundable and non-refundable tickets. 1. What is Southwest airlines ' cancellation policy? Southwest airlines provides a flexible 24-hour cancellation policy. This allows passengers to cancel their bookings within 24 hours of ticket purchase and receive a full refund, regardless of the fare selected. For cancellations and immediate refunds, you may contact their toll-free number at ?? ?-888-356-9445.