Main Terminal
Check-in, security checkpoints, baggage claim and ground transportation.
Seattle–Tacoma International Airport (SEA) terminal guide
Seattle, Washington KSEA #12 US airport by passengers
How SEA is laid out and how to move between buildings.
Terminals at SEA
Concourses A, B, C and D
The main domestic gates. Alaska Airlines is concentrated in several of these.
North Satellite (N gates)
A separate building reached by an underground train. Hosts Alaska and others.
South Satellite (S gates)
A separate building reached by an underground train. Hosts international and domestic flights.
International Arrivals Facility
A dedicated customs and immigration building that opened in 2022. International arrivals clear customs here.
Moving between terminals
The Satellite Transit System is an underground train that runs between the Central Terminal and the North and South Satellites. Concourses A to D are linked by walkways. Leave extra time if you are changing to a satellite gate.
Reviewed October 8, 2026. Confirm details on the official airport website. Spotted a change?