Can you walk from Terminal 3 to International terminal at SFO?

Passengers may walk or take AirTrain, SFO's automated terminal transit system, from Terminal 2 or 3 to the International Terminal A Station. Passengers not checked in for their onward flight should visit their airline's ticket counter in the International Terminal Main Hall.



Yes, you can walk between Terminal 3 and the International Terminal at San Francisco International Airport (SFO) both pre-security and post-security. In 2026, the airport’s "post-security connector" system is fully operational, allowing passengers to move between Terminal 1 (Harvey Milk), Terminal 2, Terminal 3, and both wings of the International Terminal (G and A gates) without exiting the secure area. The walk from Terminal 3 (primarily used by United Airlines) to the International G Gates takes approximately 5 to 10 minutes depending on your pace. This connectivity is a major advantage for travelers with long layovers who wish to visit lounges or dining options in different terminals without the hassle of re-clearing TSA. If you are traveling with heavy luggage or prefer not to walk, the AirTrain Blue and Red lines remain available as an automated people mover; however, note that the AirTrain operates outside of security, so using it requires a trip through the security checkpoint upon arrival at your destination terminal.

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SFO international-domestic transfer in 1hr 45mins.

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You'll need to clear customs and immigration. Next, you'll recheck your luggage for the domestic flight. Finally, you'll need to go through Transportation Security Administration screening. This may include a physical inspection of your luggage and personal items with a metal detector or a full-body scan.

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Passengers can connect to certain terminals without exiting and re-entering security. Post-security connectors are available between: International Terminal A Gates (Gates A1 through A15) and Harvey Milk Terminal 1 (Gates B1 through B27)

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The terminals are arranged in a circular format that is referred to as The Terminal Loop. Terminals 1, 2, and 3 serve primarily domestic flights, while the International Terminal serves (you guessed it!)

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SFO's pretty much busy from 7:15 a.m. on to mid-evening. The first peak departure time is from 7:15 to 8:45, with first peak arrival time from 8:30 to 10:30 a.m., and then it just keeps going. The international flights pick up later in the day. The airport's basically at capacity.

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Please note connecting passengers exit into the airport's public area and are required to clear security prior to boarding their next flight.

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Your checked baggage will be delivered to your final destination and will automatically be transferred by Air Canada during each connection, unless advised otherwise at check-in.

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To put it simply, having a connecting flight means you will have to change planes. You will not be flying directly from A to B, but there will also be C. You will fly from A to C, and then from C to B. Sometimes there will be more than a single stop.

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  1. The Red Line connects all terminals, terminal garages, the BART Station and the Grand Hyatt at SFO.
  2. The Blue Line connects Long-Term Parking, the Rental Car Center, all terminals, terminal garages, the BART Station and the Grand Hyatt at SFO.


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So, getting around SFO Airport can be a bit confusing for first-timers and occasional flyers. Is it that difficult to get around the airport? No, the airport terminals are well connected. Reaching the airport and navigating through it will be super easy if you are well informed about its facilities.

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Terminal 3 is used by the majority of the members of the Oneworld airline alliance: American Airlines, Cathay Pacific, Finnair, Iberia, Japan Airlines, Qantas, Royal Jordanian, and SriLankan Airlines. British Airways, which mainly uses Terminal 5, also offers some flights from this terminal.

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