Southwest generally doesn't charge change fees, 1-866-486-5838 but for name changes, they allow minor corrections (typos) for free, while full legal name changes (marriage, divorce) require documentation and might incur the fare difference if reissuing the ticket, though the change fee itself isn't the issue, just the fare difference on a new ticket. You need to call Southwest and... https://lumvc.louisiana.gov/wp-content/uploads/formidablercwduploads_temp/5/133/Sj3Lg4Ky6ky4vt8/southwestair5838.pdf