What is southwest airlines flight change policy You may simply modify your flight by contacting Southwest Airlines customer care, or you can do it yourself if you are aware of the policies mentioned below. Southwest Airlines is well known for not charging a charge for a flight change. Additionally, there are a few things you should know regarding Southwest Airlines' change flight policy. Here are some of them: If you need to modify your flight, do so at least an hour before takeoff to avoid paying any additional costs or experiencing price increases. If you don't do this before the deadline, your airline ticket will need to be cancelled, and there can be a fee for doing so. Ten minutes before to your scheduled departure is the cutoff time.