United Airlines primarily operates from Terminal 3 at San Francisco International Airport (SFO). Terminal 3 serves as a central hub for United, facilitating both domestic and international flights. Passengers departing or arriving on United Airlines at SFO can find dedicated check-in counters, security checkpoints, and various amenities within Terminal 3. The terminal offers a range of services, including dining options, retail stores, and United Club lounges for eligible passengers. Terminal assignments can change, so it’s important to verify the current information with the airline or the airport closer to your travel date for the latest details on SFO United Terminal.