Passengers have the right to change their flights at least 10 minutes before departure if they need to postpone or change flights for any reason. Southwest Airlines will not charge you an extra fee if they change your flight for any reason. According to Southwest Airlines' trip change policy, if you rebook a more expensive flight than your initial booking, you must pay the difference in fare. https://flightcancellationpolicy.com/southwest-airlines-flight-change-policy