United Airlines primarily operates from Terminal 3 at San Francisco International Airport (SFO), also known as the San Francisco International Terminal. However, please note that terminal assignments can change due to various factors such as airport renovations, expansions, or adjustments in airline operations. Therefore, it's crucial to verify the current terminal information for United Terminal SFO closer to your travel date.

Here's a more detailed overview of United Airlines' operations at SFO:

Terminal 3 (SFO): United Airlines has a significant presence at Terminal 3, which is also known as the San Francisco International Terminal. This terminal serves both domestic and international flights. United's check-in counters, ticketing, security checkpoints, baggage claim, and gates are located in this terminal.

- Domestic Flights: For domestic flights, United Airlines uses Terminal 3 at SFO. Passengers can check in for their flights, pass through security, and find their gates within this terminal. Terminal 3 is divided into two concourses: Concourse F and Concourse E.

- International Flights: United Airlines also operates international flights from Terminal 3. Passengers travelling on international routes will typically clear customs and immigration at this terminal. United's international gates are located in Concourse G of Terminal 3.

To find the most up-to-date terminal information for your United Airlines flight at SFO, consider the following steps:

1. Visit the Airport Website: SFO's official website is a reliable source for terminal information. They often provide a list of airlines and their respective terminals.

2. Use the United Airlines Website: The United Airlines website provides information about airport terminals. You can enter your flight details or use the "Airport Information" section to confirm your terminal.

3. Contact United Airlines: Reach out to United Airlines directly through their customer service or reservation helpline. Their representatives can provide you with the most accurate and current information regarding your flight's terminal assignment.

4. Check Your Boarding Pass: Once you check in for your flight, your boarding pass will indicate the terminal and gate information for your specific flight. This information is usually printed on the boarding pass or available in your mobile app.

5. Arrive Early: Regardless of the terminal, it's always advisable to arrive at the airport well in advance of your flight's departure time. This allows you ample time to navigate through security, find your gate, and address any unexpected changes.

6. COVID-19 Considerations: Be mindful of any potential changes or restrictions related to COVID-19 that may impact airport operations and gate assignments. Check the airline and airport websites for updates on health and safety measures.

By following these steps and staying informed, you can ensure a smooth travel experience when flying with United Airlines from San Francisco International Airport. Remember to double-check the terminal assignment closer to your travel date to account for any potential changes.