SEAAirport Guide

Which concourse is my airline at SEA?

Alaska uses C, D and N at SEA. Delta uses A and B. United and Southwest use B. Check your gate before choosing a checkpoint.

The tall curved glass wall and white arched roof of the Central Terminal hall at Seattle-Tacoma airport, seen from the floor beside a column.
Central Terminal hall, SEA

At SEA, Alaska’s gates span C, D and N. Delta uses A and B. United, Southwest and Frontier use B, and American uses D. Many international airlines use the S Concourse. Most airline counters are on Level 5 before security. Alaska also has bag drops on Level 4 by Skybridges 5 and 6.

SEA is one terminal. A, B, C and D connect on foot, while N and S need a train.

Find your airline

The Port of Seattle’s airline directory names concourses, but not flight-specific gates. Use the gate on your boarding pass to choose your route.

Airline Concourse Getting there
Alaska Airlines C, D and N Walk to C and D, train to N
Delta Air Lines A and B Walk
United Airlines B Walk
Southwest Airlines B Walk
Frontier Airlines B Walk
American Airlines D Walk
WestJet A and B Walk
Hawaiian Airlines S Train
JetBlue Airways S Train
Aer Lingus S Train
AeroMexico S Train
Air Canada S Train
Air France S Train
ANA (All Nippon Airways) S Train
Asiana Airlines S Train
British Airways S Train
Cathay Pacific S Train
China Airlines S Train
Condor S Train
Emirates S Train
EVA Air S Train
Finnair S Train
Hainan Airlines S Train
Icelandair S Train
Japan Airlines S Train
Korean Air S Train
Lufthansa S Train
Philippine Airlines S Train
Qatar Airways S Train. Confirm flight status with Qatar
SAS S Train
Singapore Airlines S Train
STARLUX Airlines S Train
Turkish Airlines S Train
Virgin Atlantic S Train
Volaris S Train
Sun Country Airlines Refer to your boarding pass See below
AMC (Air Mobility Command) Refer to your boarding pass See below

The S airlines above check in on the Main Terminal ticketing level, Level 5, before security. The Port of Seattle lists Qatar at S, so confirm your flight with Qatar before leaving. Use the Airlines at SEA directory to find your carrier’s check-in spot. If your ticket names one airline but another operates the flight, check in with the operating carrier named on your itinerary.

Hawaiian stays on S even though Alaska and Hawaiian share a guest services point on the ticketing level. One traveler reported getting turned around on the walk from a Hilton through the parking garage and filmed Hawaiian’s sign below Alaska’s.

Airlines on more than one concourse

If you’re flying Alaska and your pass says N, you’ll need the Green Line after security.

Sun Country checks in on the Main Terminal ticketing level, Level 5, before security.

On arrival, the Port lists these domestic baggage claim carousels and airline phone lines:

Airline Baggage claim carousels Missing-bag phone line
Alaska 7, 9, 10, 11, 12, 14 and 16 877-815-8253
Delta 2, 3, 4, 5 and 6 800-325-8224
Sun Country 2 Not listed
United 9 1-800-335-2247
Southwest 10 and 11 1-800-435-9792
American 13 800-433-7300
Frontier 7 801-401-9000
JetBlue 3 1-800-538-2583
Hawaiian 2 866-389-6654
Air Canada 9 1-888-689-2247
Aer Lingus 2 Not listed

Qatar is the airline to ask about its SEA flights.

Reaching your concourse

Concourse How you get there Station
A Walk A Station, across from Gate A3
B Walk B Station, below Gates B20 and B21
C Walk C Station, by Gate C11
D Walk D Station, across from Gate D2
N Green Line N Station, below the concourse
S Blue Line S Station, below the concourse

The Blue Line links S, B and A Stations, and the Green Line links N, C and D Stations. The Yellow Line shuttles between A Station and D Station, so a trip from N to S means the Green Line to D, the Yellow Line to A, then the Blue Line to S. The platforms are on Level 2.

You can reach every gate from any checkpoint. Checkpoint 1 is on the baggage claim level, Level 3, and is one of the closest to A and S. It runs from 4 a.m. to 8 p.m. Checkpoints 2 and 3 are also closest to A and S. Their hours are 4 a.m. to 4 p.m. and 4 a.m. to 11:30 p.m., respectively.

Checkpoint 4 is closest to the Central Terminal, B and C. It stays open 24 hours for an early or late flight. Checkpoints 5 and 6 are closest to C, D and N. Checkpoint 6 runs from 4 a.m. to 10 p.m. The security page lists hours for every checkpoint. Gates B20 and B21 and the D Annex gates D21 through D26 are on Level 3, not the main gate level.

Where to check in

American Airlines, Frontier Airlines, Southwest Airlines, United Airlines and WestJet check in on the Main Terminal ticketing level, Level 5, before security.

  • Alaska Airlines. A check-in point sits near Door 29. Kiosks, bag tag stations and bag drops are also on Level 4 by Skybridges 5 and 6, one level below ticketing. One traveler reported under KING 5’s video on the renovated Alaska area that the automatic bag drops didn’t work without an attendant.
  • Delta Air Lines. Curbside check-in is on the upper departures drive near Door 17.
  • Icelandair. Its counter is near Door 19.
  • AMC (Air Mobility Command). Duty passengers on travel orders use the last six counters, next to Checkpoint 2. The Port of Seattle’s AMC listing says check-in opens 6 hours before departure. Space-A roll call is 3 hours before departure at the ticketing-level counters.

Arriving by Link light rail with Alaska bags? The free Train-to-Plane cart runs daily from 5 a.m. to midnight between the station and Skybridges 5 and 6.

Connecting from an international flight

Connecting international passengers pass through baggage claim, passport control, airline recheck and the IAF Transfers security checkpoint. That checkpoint exits into the A Concourse. One traveler commenting under the Port of Seattle’s video reported that the walk from the gate to passport control is long.

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