Do you know Which Terminal is Southwest Airlines at SFO? San Francisco International Airport’s (SFO) Terminal 1 is home to Southwest Airlines. The Harvey Milk Terminal is another name for this terminal. All of the check-in desks and gates for your flights are located in this terminal if you are flying with Southwest. While you wait for your flight, you can enjoy a selection of stores and eateries there. Gate assignments are subject to change, so be sure to verify your flight information before leaving for the airport. To prevent any last-minute anxiety, it’s usually a good idea to arrive early!