To cancel a flight on Southwest Airlines follow these steps Visit the Southwest Airlines website or open the mobile app Log in to your Southwest account or access the Manage Reservations section Locate the flight you wish to cancel and select the option to cancel. If eligible for a refund, the amount will be credited to your Southwest account as travel funds or back to the original payment method, depending on the fare type and cancellation time frame. You can also cancel your flight by calling Southwest Airlines' customer service at 1-844-296-4458 and speaking with a representative.