What Terminal Is United at SFO:- When it comes to flying into San Francisco International Airport (SFO), United Airlines passengers will find themselves primarily operating out of Terminal 3. This terminal serves as the main hub for United's domestic and international flights, providing a convenient and efficient travel experience. Terminal 3 offers a range of amenities, including various dining options, shopping outlets, and comfortable seating areas. With its modern design and state-of-the-art facilities, passengers can expect a seamless journey from check-in to boarding. So whether you're arriving or departing from SFO with United Airlines, Terminal 3 is your gateway to a hassle-free travel experience.