United Airlines San Francisco Airport Terminal refers to the specific terminal at San Francisco International Airport (SFO) where United Airlines operates its flights. United Airlines primarily operates out of Terminal 3 at SFO. Passengers flying with United Airlines will find check-in counters, security checkpoints, boarding gates, and baggage claim services in this terminal. Additionally, Terminal 3 offers a range of amenities, including dining options, retail stores, and other services to improve the passenger experience. So, when searching for the "United Airlines San Francisco Airport Terminal," the answer is Terminal 3 at San Francisco International Airport.