Southwest Airlines is an airline like no other in the world of aviation. Due to Southwest's flight change policy, we have given it the nickname "unique". Southwest Airlines is considered to have the most accommodating change policy of any major airline. Most airlines impose a significant penalty for changing a ticket after it has been purchased. Southwest Airlines has established itself as a pioneer and model for other airlines by refusing to charge change fees on domestic and international flights. We've put together a guide to Southwest Airlines date change policy that you should keep in mind if you need to change your flight. Changing a flight on Southwest is free. Airlines companies. While many other airlines charge high fees, Southwest seems to recognize the importance of customer crises and charges nothing.