SEA: Seattle-Tacoma International Airport survival guide
Sea-Tac has one main terminal with Concourses A through D, plus the N and S satellite concourses reached by underground trains. It's Alaska Airlines' main hub, and Link light rail runs to downtown Seattle.
Last checked October 2026. Confirm details on Sea-Tac Airport (official).
SEA at a glance
| Layout | Main terminal, Concourses A to D, N and S satellites |
|---|---|
| Between areas | SEA Underground trains to N and S gates |
| Public transit | Link light rail to downtown Seattle |
| Biggest airlines | Alaska and Delta |
Tips for SEA
- If your gate starts with N or S, budget time for the train.
- Link light rail is the easy way downtown.
- Security lines can spike in the morning. Arrive early.
- Yes, there is good coffee. Yes, there is a line.
Universal airport tips
- TSA PreCheck usually means shorter lines, and you keep your shoes on.
- Screenshot your boarding pass in case the app or Wi-Fi fails.
- Know your rights before something goes wrong: refunds, bumping, and lost bags.