Southwest Airlines offers a unique seat selection process compared to other airlines. Instead of assigning seats, Southwest operates on an open-seating policy. When you book a flight, you won't select a specific seat. Instead, passengers are assigned a boarding group (A, B, or C) and a boarding number upon check-in, which determines the order in which they board the plane. This system means that you can choose any available seat once you board the aircraft. Early check-in, which opens 24 hours before the flight, is crucial as it improves your chances of obtaining a better boarding position and thus more seat choices. For those looking for a bit more convenience, Southwest also offers EarlyBird Check-In, a paid service that automatically checks you in and improves your boarding position.
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Southwest Airlines Seat Selection Policy | Fly with Comfort

With Southwest Airlines seat selection, passengers are free to choose any open seat on a plane once they board. Pick your favorite seat.