Seattle–Tacoma Int’l. Airport (SEA) Main Terminal
The Main Terminal at Seattle-Tacoma International Airport (SEA) serves as the central hub for all airport operations. The Main Terminal is subdivided into four concourses: Concourse A, B, C, and D. Each concourse offers a range of amenities, services, gates, and airline operations. It integrates airline check-in, security processing, baggage claim, ground transportation, and connections to concourses and satellite terminals through a well-structured, multi-level layout.
Seattle-Tacoma International Airport Terminal Levels
| Upper Level (Departure) | Airline ticketing countersSecurity checkpointsEntry points to all concourses |
| Lower Level (Arrival) | Baggage claim carouselsGround transportation servicesPassenger pick-up zone |
SEA Airport Concourse A
Airlines
- Delta Airlines
- United Airlines
- WestJet
Gates: A1 to A14, A20 and A21
SEA-TAC Airport Concourse B
Airlines
- Delta Air Lines
- Frontier Airlines
- WestJet
Gates: B1, B3, B5, B5a
SEA Airport Concourse C
Airlines: Only Alaska Airlines use concourse C for all its operations.
Gate: C9, C11, C15, C20, C16A/B, C2A/B, C2C/D, C2G/H, C2E/F, C2N, C10A/B, C10C/D, and C10E/F
SEA Airport Concourse D
Airlines
- Alaska Airlines
- American Airlines
Gates: D1 to D10, D20, D22, D25
Services Provided at SEA-TAC Airport Main Terminal
- Information Desk
- WiFi
- Rest Rooms
- Nursing Rooms
- Pet-Relief Area
- Lost and Found
- Beecher’s Handmade Cheese
- McDonald’s
- Starbucks
- Seattle Made (local retail products)
Frequently Asked Questions (FAQs)
The Main Terminal serves 7 airlines, including Alaska Airlines, Delta Air Lines, American Airlines, United Airlines, Southwest Airlines, Frontier Airlines and WestJet.
Yes, baggage claim is on the lower (Arrivals) level of the Main Terminal.
Yes, SEA Airport offers free high-speed Wi-Fi throughout the Main Terminal and all connected areas.