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Do you know Which Terminal is Southwest Airlines at SFO? Southwest Airlines operates out of Terminal 1, also known as the Harvey Milk Terminal, at San Francisco International Airport (SFO). This terminal serves several domestic flights and has gates from B2 to B27. If you’re flying with Southwest, you can check in, go through security, and board your flight all within this terminal. Make sure to arrive early to enjoy the amenities available before your flight!