Which Terminal is Southwest Airlines at SFO Southwest Airlines operates out of Terminal 1 (Harvey Milk Terminal) at San Francisco International Airport (SFO). This modern terminal is equipped with numerous amenities, including dining options, retail shops, and spacious waiting areas. Terminal 1 offers a convenient and efficient travel experience for Southwest passengers, featuring streamlined security checkpoints and easy access to baggage claim. Whether you’re departing or arriving, Terminal 1 ensures a smooth and pleasant journey with its state-of-the-art facilities and services tailored to meet the needs of travelers.