Do you get charged if you cancel a Southwest flight?

No, Southwest does not charge fees to cancel or change flights. You can cancel your Southwest flight at no cost up to 10 minutes prior to the scheduled departure time by calling the Southwest Airlines Customer Service phone number at +1 860 374 7617 or 1-800-I-FLY-SWA (1-800-435-9792). When you call, select the option to speak to a live representative who can help cancel your flight reservation without fees or penalties.
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