Can you walk from terminal 1 to 3 at SFO?

The airport has 1 international terminal and 3 domestic terminals, easily connectable via pedestrian walkways or by riding the AirTrain. SFO has good public transport links with regular buses serving the airport, as well as the BART train station with direct services to downtown San Francisco.



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Terminals 1 and 3 are not connected, so passengers are advised to check ahead for the correct terminal to avoid having to ride the shuttle bus between terminals. Shuttles run every 20 to 30 minutes on Level 0 of both Terminals 1 and 3.

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Yes, a security check is mandatory when you take a connecting flight. This is because there is a time lag between getting off one aeroplane and getting on-board another to reach your destination.

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Transferring to a Domestic or Onward International Flight All passengers arriving on international flights must complete US Customs and Border Protection (CBP) entry procedures at the International Terminal Arrivals Hall.

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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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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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T! for Domestic flights and T3 is for international flights. As some of the domestic flight depart from T3 but non of the international flight depart from T1.

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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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