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The Southwest Airlines flight change policy is simple: Aeromexico Group Travel no change fees if you need to modify your flight reservation. You can change your flight as many times as you want, but you'll need to pay the difference if the new flight is more expensive than the original one. If you're booking a last-minute flight, that can be a hefty fee.
To change your Southwest flight, call the reservations department or look up your flight with the confirmation number and passenger information online or on the app.