United Airlines operates primarily out of Terminal 3 at San Francisco International Airport. Terminal 3 is designed to handle domestic flights and offers a wide range of amenities including dining, shopping, and lounges to enhance passenger comfort. For international United flights, travelers may use the adjacent International Terminal, which is connected to Terminal 3, providing easy access for connecting flights. If you’re wondering what terminal is United Airlines at SFO, it’s important to note that most United flights depart and arrive at Terminal 3, making it the central hub for United Airlines at San Francisco International Airport. Whether you’re flying within the U.S. or internationally, Terminal 3 offers efficient check-in, security, and boarding processes to ensure a smooth travel experience.