Which Terminal is Southwest Airlines at SFO operates out of Terminal 1 at San Francisco International Airport (SFO), specifically in the Harvey Milk Terminal 1. This recently renovated terminal offers modern amenities, including spacious seating areas, a variety of dining and retail options, and convenient access to security checkpoints and baggage claim. Terminal 1 is well-connected to the rest of the airport via the AirTrain system, which links all terminals, parking facilities, and BART (Bay Area Rapid Transit) for easy transportation to and from San Francisco and surrounding areas.