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Both domestic and international flights on Southwest Airlines are free of change fees. The procedure used is described below:

There will be no change fee

Your travel arrangements might need to be modified owing to an unexpected change in plans or an emergency circumstance. Southwest Airlines welcomes changes to your reservation and offers the greatest amount of flexibility by not imposing any change fees.

You only need to pay the cost difference if you want to change your flight's itinerary. There are no additional modification fees or any hidden costs.
You won't be charged by the airline for last-minute changes to your plans or emergencies.

So you can rest confident that Change fees
do not fly with us when purchasing your next Southwest Airlines travel, the airline states.

Read also : Frontier Airlines change fees | Jetblue Airlines change fees