You must check in 24 hours before your flight. Set an alarm to get the best seats.
Southwest offers numerous aircraft configurations and seat arrangements. Knowing the aircraft layout helps you choose seats or sections that suit your tastes."
"If you bought a Group A ticket but missed the boarding phase, you may still get a superb seat by cutting in line.
"When you board, aim for complete rows with an available center seat. Some customers avoid rows with open middle seats in hopes of a no-show neighbor.
Choose off-peak flights if you have flexibility in your travel plan. Flights with fewer passengers have greater seat possibilities.
Southwest's EarlyBird Check-In for a better seat if you're ready to pay. This paid add-on lets you check in 36 hours before departure, 12 hours before usual check-in opens.
Southwest has lately restricted EarlyBird Check-In options for some itineraries. If you can't afford that add-on service or want a nicer seat, buy the carrier's most costly price, Business Select.