Located in SeaTac, Washington, Seattle–Tacoma International Airport lies about 14 miles south of downtown Seattle and 18 miles north-northeast of downtown Tacoma. Covering 2,500 acres with three parallel runways, it is owned and operated by the Port of Seattle. As the busiest airport in the Pacific Northwest, Sea–Tac serves as the primary hub for Alaska Airlines and a major hub and international gateway for Delta Air Lines.
The airport features a Main Terminal flanked by Concourses A, B, C, and D, alongside a Central Terminal and two satellite terminals. Passengers travel between the Main Terminal and satellite facilities using an underground automatic shuttle train system. Recent modernizations include a dedicated International Arrivals Facility that opened in 2022 to handle growing overseas passenger volume, as well as expanded concourses equipped with moving sidewalks, artwork, and dining options.
01 Terminals & concourses
Houses the Central Terminal alongside Concourses A, B, C, and D, offering dining options, moving sidewalks, and public art. It connects directly to satellite facilities via an underground train system.
Two satellite terminals provide additional gate capacity. They are connected to the Main Terminal by an automated underground shuttle train.
Opened in 2022 to support growing international flights and passenger arrivals.
Airport map
The free OpenStreetMap layer below shows the whole airport — terminals, concourses, access roads and the parking garages. Zoom in for gate-level detail.
Map: © OpenStreetMap contributors (ODbL, free). Official gate/terminal maps are copyrighted — we link to them.
Lost, delayed or damaged baggage at SEA
If your checked bag doesn't turn up on the belt, act before you leave the baggage-claim area — that's where every airline keeps its Baggage Service Office.
- Go to your airline's Baggage Service Office in the baggage-claim hall of your arrival terminal.
- File a Property Irregularity Report (PIR) and get your file reference (WorldTracer) number. Keep your bag-tag receipt and boarding pass.
- Track it online using that reference on your airline's baggage-tracking page — most bags are located within 24–48 hours.
- Claim your essentials. On delayed bags airlines reimburse reasonable interim purchases (toiletries, clothing) — keep receipts. International trips are covered by the Montreal Convention.
- If it's truly lost (generally after 21 days) or damaged, file the claim at the same office — damage must be reported before you leave the airport.
Left something in the terminal (not a checked bag)? That's handled by the airport Lost & Found. Items left at a TSA security checkpoint are held by the TSA, not the airline.
02 Getting to & from SEA
These are the ground-transport options connecting the airport with the city. Fares and schedules change — check the operator before you travel.
| Option | Details |
|---|---|
| People mover | An underground automated train system connects the Main Terminal with the two satellite terminals. |
| Road | South 188th Street runs underneath a runway extension via an automobile tunnel. |
