During my recent trip through San Francisco International Airport (SFO), I flew with Southwest Airlines and had to navigate Southwest Airlines SFO Terminal to find my gate. If you're wondering what terminal is Southwest Airlines at SFO, it operates out of Terminal 1, also known as the Harvey Milk Terminal. The check-in counters, security, and boarding gates are all conveniently located within this modern terminal, which offers a smooth travel experience. With spacious seating areas, dining options, and easy access to baggage claim, Terminal 1 at SFO made my journey with Southwest Airlines stress-free and efficient.