Southwest Airlines flight cancellations are straightforward, and the company strives for customer pleasure at all times. Southwest cancellation Policy allows you to cancel your flight through phone or online. Southwest flights can be cancelled online (through the website or the Southwest app) or offline (by phone). Passengers are permitted to select their preferred form of flight cancellation. You can even reschedule your Southwest travel if their flight policy or ticket cancellation policy allows it. Southwest Airlines provides these alternatives 24 hours a day, seven days a week.