Do you know Which Terminal is Southwest Airlines at SFO? At San Francisco International Airport (SFO), Southwest Airlines is located in Terminal 1. The terminal is marked and easy to identify. The personnel was welcoming, and check-in was easy. While I waited for my flight, I enjoyed the abundance of stores and dining options. The speed at which the security lines moved was excellent. I had a smooth and enjoyable trip at Terminal 1 overall. Simply travel to Terminal 1 if you’re flying Southwest, and you ought to have a pleasant journey!