Are all terminals connected at Seattle airport?

SEA has 103 gates in four concourses and two satellite buildings. The two satellite terminal buildings, named the North and South Satellites, are connected to the four concourses in the main terminal by a three-line automated people mover system called the SEA Underground.



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Get to all gates: The A, B, C, and D Concourses are all connected and you can walk or take the train to any of those four. To get to the N and S Concourses, you'll have to take SEA Underground since they're not connected to other gates.

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Why do many major airports have separate terminals for domestic and international flights? International flights require passengers to pass through immigration and customs checks on arrival. Domestic flights do not.

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Seattle-Tacoma International Airport—more commonly called SeaTac Airport or even just SeaTac—is the main travel hub for the Pacific Northwest and one of the 20 busiest airports in the U.S.1? Despite that business, SeaTac is relatively easy to get around, and has plenty of shops and restaurants to make sure you're not ...

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For connecting domestic flights, you almost never have to exit and reenter security, though there are some exceptions at airports where the terminals aren't all connected. For domestic-to-international connection, it's still pretty rare that you have to exit and reenter security, even if you're changing terminals.

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If you checked a bag, you'll have to collect it from baggage claim from the international flight. You'll need to clear customs and immigration.

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If you are connecting from one flight to the next on the same airline, you may remain behind security. Your connecting flight will be in the same terminal. If you are connecting to a flight on another airline, you may have to change terminals.

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There's no uniform answer. At some airports, yes, all the terminals are connected post-security, so that you can get from one to another quickly. At others, the terminals can be quite far apart and connected only by rail or bus.

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Allow enough time: Customs can be time-consuming, especially during peak travel periods. Make sure you allow enough time to clear customs and get to your connecting flight. As a general rule, it's best to allow at least two hours for international layovers.

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There are no separate terminals for domestic and international departures at T3. You simply exit from your flight and walk in the direction the signs point to exit. Somewhere in between, while you are walking to towards exits, you should see signage for international transfers.

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