United Airlines predominantly operates from United Airlines SFO Terminal. Terminal 3 serves as a major hub for United, handling both domestic and international flights. Passengers traveling with United from SFO can access 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 crucial to verify the current information with the airline or the airport closer to your travel date for the most up-to-date details on United Airlines' departure terminal at San Francisco International Airport.