Which Terminal is Southwest Airlines at SFO Southwest Airlines operates from Terminal 1, also known as Harvey Milk Terminal 1, at San Francisco International Airport (SFO). This modern terminal offers extensive amenities, including dining, shopping, and art installations, ensuring a pleasant travel experience. Terminal 1 is equipped with advanced security facilities, accessible features, and sustainability initiatives. Travelers can check in at dedicated counters, utilize self-service kiosks, and enjoy comfortable waiting areas with free Wi-Fi and charging stations. With efficient operations and excellent customer service, Southwest Airlines ensures a smooth journey for passengers at SFO.