1. visit www.southwest.com and log in
  2. Enter the name of the traveller or your booking number.
  3. To make modifications, select the Southwest flight ticket.
  4. Now select Change flight from the menu.
  5. Change the date, the flight, or the location, then click "Submit".
  6. Now pay the "Change flight charge" for Southwest Airlines ( If applicable).
  7. Download the updated Southwest airline ticket that you just received through email.


Read also : Finnair Airlines change flight | United Airlines change flight