Terminal 1 (Harvey Milk Terminal)
Recently rebuilt. Serves several domestic airlines; check your ticket or the airport website for your airline.
San Francisco International Airport (SFO) terminal guide
San Francisco, California KSFO #10 US airport by passengers
How SFO is laid out and how to move between buildings.
Terminals at SFO
Terminal 2
Serves several domestic airlines; check your ticket or the airport website for your airline.
Terminal 3
United Airlines is the main user, along with some partner airlines.
International Terminal (Boarding Areas A and G)
Most international flights, including United's international departures from Boarding Area G. BART connects directly to this terminal.
Moving between terminals
AirTrain runs on two loops (Blue and Red) that connect all terminals, garages, the rental car center and the BART station. It is free. Inside security, you can walk between some of the terminals, but the International Terminal and the domestic terminals are separate for security purposes.
Reviewed October 8, 2026. Confirm details on the official airport website. Spotted a change?
Frequently asked questions
Which terminal is United at?
Terminal 3 for domestic, and the International Terminal (Boarding Area G) for most international flights.