Seattle–Tacoma (SEA) Terminal Map & Navigation Guide
Everything you need to navigate Seattle–Tacoma: the official terminal map link, what airlines fly from each concourse, how to move between terminals, and gate-finding tips that save you backtracking. Verify your specific gate on your boarding pass — assignments change.
Where can I find the official Seattle–Tacoma terminal map?
The SEA airport authority publishes the most up-to-date map on its official website. Use the link below before you travel so you know the terminal layout and gate locations before you clear security.
Official map
Seattle–Tacoma official terminal map — airport authority website
Seattle–Tacoma interactive map — searchable by gate, airline, or amenity
Maps are updated when terminals are renovated or new concourses open. Terminal 5 at LAX, for example, has been closed since October 2025 for reconstruction — always confirm your terminal from your boarding pass rather than relying on a saved map.
What is in each Seattle–Tacoma terminal?
Here is what each terminal or concourse at SEA handles — which airlines fly from it, the gate range, and key amenities to know before you go.
Concourse A
16 gates on the south side of the main terminal. Home to Delta Air Lines, United Airlines, and some international carriers. Connected to the South Satellite via sterile walkway and overhead bridge for international arrivals.
Concourse B
17 gates on the south side of the main terminal. Serves Delta Air Lines, Southwest Airlines, Frontier Airlines, and WestJet. Walking distance from Concourse A through the central terminal.
Concourse C
27 gates — the largest concourse — on the north side of the main terminal. Operated almost exclusively by Alaska Airlines. Walking distance from Concourse D through the central terminal.
Concourse D
17 gates on the north side of the main terminal. Shared by Alaska Airlines and American Airlines. Adjacent to Concourse C and accessible by walking or the underground train (yellow line to Concourse A).
North Satellite (N Gates)
20 gates dedicated primarily to Alaska Airlines. A standalone satellite building only reachable via the SEA Underground green-line automated train from Concourses C and D. No airside walking connection.
South Satellite (S Gates)
14 gates handling the majority of international long-haul traffic: Air Canada, British Airways, Cathay Pacific, Emirates, Japan Airlines, Korean Air, Lufthansa, Qatar Airways, Singapore Airlines, Turkish Airlines, and others, plus Delta and Hawaiian Airlines. Only reachable via the SEA Underground blue-line automated train from Concourses A and B. International arrivals clear customs here.
How do I get between terminals at Seattle–Tacoma?
SEA Underground — a fare-free automated people mover with three color-coded lines operating entirely within the secure (post-security) area: Blue Line connects Concourses A, B, and the South Satellite; Green Line connects Concourses C, D, and the North Satellite; Yellow Line links Concourse A directly to Concourse D. Concourses A, B, C, and D are also walkable through the central terminal above ground. The two satellite terminals (N and S) are only accessible via train — there is no airside walking path to them.
Timing tip
Always allow 15–30 minutes for any inter-terminal transfer at SEA — wait times for people-movers, buses, or security re-screening add up faster than the physical distance suggests. Build the buffer into your Leave-By time, not your gate arrival time.
How do I find my gate at Seattle–Tacoma?
SEA has one terminal but two satellite buildings that can only be reached by the underground train — if your gate is in the North Satellite (N gates, Alaska) or South Satellite (S gates, international), you must take the SEA Underground train after clearing security; budget an extra 10–15 minutes. Use maps.flysea.org or the free flySEA app for real-time directions and security wait times before you arrive.
A few habits that prevent last-minute sprints:
- Open your airline app two hours before departure. Gate assignments update in the app before they appear on printed boarding passes and sometimes before terminal displays are updated.
- Check departure screens immediately after clearing security. Every terminal at SEA has overhead departure boards near the checkpoint exit — confirming your gate here costs 30 seconds and can save a long detour.
- Note which security checkpoint serves your concourse. At multi-concourse airports, entering through the wrong checkpoint can mean exiting security and re-queuing, which adds 20 minutes or more.
- International arrivals follow the customs signs first. If you are connecting from an international arrival, clear U.S. Customs and Border Protection before looking for your domestic connection gate — the process is one-way.
What is the easiest way to navigate Seattle–Tacoma?
Experienced travellers at SEA use a short checklist every time:
- Review the map before leaving home. Open the Seattle–Tacoma interactive map on your phone while you are still home so the terminal layout is familiar.
- Know your terminal before you arrive. At airports with multiple separate buildings (JFK, LAX, DTW, MSP) confirm your terminal from your boarding pass — rideshare and taxi drivers need the correct terminal to drop you at the right curb.
- Use automated people-movers instead of walking. At large airports with trains (ATL Plane Train, DFW Skylink, DEN AGTS) a single train ride replaces 20–30 minutes of walking. Look for signs to the train immediately after clearing security.
- Follow colour-coded signage. Most airports (TPA Blue/Red, SEA North/South Satellite, PHX T3/T4) use colour or number coding from curbside through gates — picking the right colour zone at check-in means you do not cross the terminal twice.
- Check the live TSA wait before you leave. Knowing the current security wait at SEA lets you time your departure so you arrive at the gate relaxed, not sprinting.
Common questions about Seattle–Tacoma maps
Where can I find the official SEA terminal map?
The official Seattle–Tacoma terminal map is on the airport authority website at https://www.portseattle.org/sites/default/files/2025-05/Web-Terminal-Map-Overview_3.26.25.pdf — an interactive version is also at https://maps.flysea.org. Maps are updated when new gates or concourses open; always verify your specific gate on your boarding pass.
How do I get between terminals at SEA?
SEA Underground — a fare-free automated people mover with three color-coded lines operating entirely within the secure (post-security) area: Blue Line connects Concourses A, B, and the South Satellite; Green Line connects Concourses C, D, and the North Satellite; Yellow Line links Concourse A directly to Concourse D. Concourses A, B, C, and D are also walkable through the central terminal above ground. The two satellite terminals (N and S) are only accessible via train — there is no airside walking path to them.
How do I find my gate at SEA?
SEA has one terminal but two satellite buildings that can only be reached by the underground train — if your gate is in the North Satellite (N gates, Alaska) or South Satellite (S gates, international), you must take the SEA Underground train after clearing security; budget an extra 10–15 minutes. Use maps.flysea.org or the free flySEA app for real-time directions and security wait times before you arrive. Your boarding pass shows the exact gate. Open your airline app about two hours before departure — gate assignments sometimes change after check-in closes. Look for departure boards throughout the terminal for real-time gate information.
What is the easiest way to navigate SEA?
Use the official interactive map at https://maps.flysea.org before you arrive to familiarise yourself with the layout. SEA has one terminal but two satellite buildings that can only be reached by the underground train — if your gate is in the North Satellite (N gates, Alaska) or South Satellite (S gates, international), you must take the SEA Underground train after clearing security; budget an extra 10–15 minutes. Use maps.flysea.org or the free flySEA app for real-time directions and security wait times before you arrive.
What is in each SEA terminal?
Concourse A: 16 gates on the south side of the main terminal. Home to Delta Air Lines, United Airlines, and some international carriers. Connected to the South Satellite via sterile walkway and overhead bridge for international arrivals. Concourse B: 17 gates on the south side of the main terminal. Serves Delta Air Lines, Southwest Airlines, Frontier Airlines, and WestJet. Walking distance from Concourse A through the central terminal. Concourse C: 27 gates — the largest concourse — on the north side of the main terminal. Operated almost exclusively by Alaska Airlines. Walking distance from Concourse D through the central terminal. Concourse D: 17 gates on the north side of the main terminal. Shared by Alaska Airlines and American Airlines. Adjacent to Concourse C and accessible by walking or the underground train (yellow line to Concourse A). North Satellite (N Gates): 20 gates dedicated primarily to Alaska Airlines. A standalone satellite building only reachable via the SEA Underground green-line automated train from Concourses C and D. No airside walking connection. South Satellite (S Gates): 14 gates handling the majority of international long-haul traffic: Air Canada, British Airways, Cathay Pacific, Emirates, Japan Airlines, Korean Air, Lufthansa, Qatar Airways, Singapore Airlines, Turkish Airlines, and others, plus Delta and Hawaiian Airlines. Only reachable via the SEA Underground blue-line automated train from Concourses A and B. International arrivals clear customs here.
Leave-By calculator
Know exactly when to leave for SEA
The TSA Wait Times Leave-By calculator folds the live SEA security wait, your drive time, and terminal navigation into one exact time to leave home — so you reach your gate without guessing.
See also: Live SEA TSA wait times · SEA terminals guide · SEA security tips