1-844-868-8303 If you're changing to a flight within 24 hours, be sure to check in for your new flight after you make the change.Passengers can change their flight 24 hours before the scheduled departure.

If a flight change is requested within 24 hours, Southwest charges a fee for a flight change.

If the flight is delayed by more than 3 hours, passengers can change their flight at no charge.

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