Not sure How To Make Changes To Southwest Airlines Flight Booking? It’s straightforward. Head to the Southwest Airlines website or app, then click on “Manage Reservations.” Enter your confirmation number and name to access your flight. Select the “Change” option to adjust your travel date, time, or even destination. Southwest doesn’t charge a fee to change flights—only pay the difference in fare, if any. Prefer to speak to someone? Their customer service team can also help you make updates. Once done, you’ll get a new confirmation email. With Southwest, changing your flight is flexible, quick, and easy.