Do you know Which Terminal is Southwest Airlines at SFO? The San Francisco International Airport's (SFO) Terminal 1 is home to Southwest Airlines. The terminal is easy to find and identify. The check-in procedure was simple, and the personnel was pleasant. I took advantage of the many shops and restaurants as I waited for my flight. The security lines were forming rapidly. My experience at Terminal 1 was straightforward and pleasurable all around. Just head to Terminal 1 if you are flying Southwest, and you should have an amazing trip!