terminalwalk

Not affiliated with any airline or airport.

SeaTac airport map and walking times

SeaTac has 1 terminal and 6 concourses (A, B, C, D, N and S) with 103 gates, all connected inside security by the SEA Underground train.

Walking from Security Checkpoint 2 to the farthest gate, N18, takes about 7 to 12 minutes, train included.

Gate to gate

Your walk shows here, right under the button.

SeaTac airport map

ABCDNSA13A1B15B1C3C18D21D1N14N7S7S15Checkpoint 1Checkpoint 3Checkpoint 5Map data OpenStreetMap contributors
Security checkpointTrain stationthe SEA Underground trainthe SEA Underground trainthe SEA Underground trainYour route
Printable map (PDF)
Map as an image
SeaTac airport map: 1 terminal and 6 concourses (A, B, C, D, N and S) with 103 gates, the SEA Underground train and the security checkpoints.
SeaTac airport map from our drawing. Map data OpenStreetMap contributors.

Terminals, concourses and gates

Concourse A

16 gates. From Security Checkpoint 2: nearest A3, 1 to 2 min; farthest A21, 5 to 8 min.

All 16 gates

Concourse B

17 gates. From Security Checkpoint 2: nearest B1, 3 to 5 min; farthest B9, 4 to 8 min.

All 17 gates

Concourse C

18 gates. From Security Checkpoint 2: nearest C2A/B, 5 to 7 min; farthest C20, 7 to 10 min.

All 18 gates

Concourse D

18 gates. From Security Checkpoint 2: nearest D2, 4 to 8 min; farthest D26, 7 to 11 min. Past the checkpoint, turn right.

All 18 gates

N Gates

20 gates. From Security Checkpoint 2: nearest N1, 6 to 11 min; farthest N18, 7 to 12 min. Past the checkpoint, turn right.

All 20 gates

S Gates

14 gates. From Security Checkpoint 2: nearest S1, 4 to 7 min; farthest S8, 5 to 8 min. Past the checkpoint, turn left.

All 14 gates

Which airlines are in which terminals at SEA?

36 airlines fly from SeaTac. The airport's list gives each airline's terminal, not its gates.

Terminal A 2 airlines

  • Delta
  • WestJet

Terminal B 5 airlines

  • Delta
  • Frontier
  • Southwest
  • United
  • WestJet

Terminal C 1 airline

  • Alaska Airlines

Terminal D 2 airlines

  • Alaska Airlines
  • American Airlines

Terminal N 1 airline

  • Alaska Airlines

Terminal S 28 airlines

  • Aer Lingus
  • Aeromexico
  • Air Canada
  • Air France
  • ANA
  • Asiana
  • British Airways
  • Cathay Pacific
  • China Airlines
  • Condor
  • Emirates
  • EVA Air
Show all 28
  • Finnair
  • Hainan Airlines
  • Hawaiian Airlines
  • Icelandair
  • Japan Airlines
  • JetBlue
  • Korean Air
  • Lufthansa
  • Philippine Airlines
  • Qatar Airways
  • SAS
  • Singapore Airlines
  • Starlux
  • Turkish Airlines
  • Virgin Atlantic
  • Volaris

No terminal listed 1 airline

  • Sun Country

Gates: source pending. Airline list from portseattle.org, read 13 October 2026.

Can you walk between concourses at SEA?

Yes. Main terminal, Concourses A to D, N, S (SEA Underground): by train and on foot, and you stay inside security.

The SEA Underground train comes about every 2 minutes.

Type any two gates in the gate to gate box to see the walk.

Walking times from security

From: Security Checkpoint 2

Concourse A
Gates A1 to A211 to 8 min
Concourse B
Gates B1 to B213 to 8 min
Concourse C
Gates C2A/B to C205 to 10 min
Concourse D
Gates D1 to D264 to 11 min
N Gates
Gates N1 to N206 to 12 min
S Gates
Gates S1 to S164 to 8 min

Walking from Security Checkpoint 2 to gate N18 at SEA takes about 7 to 12 minutes, train included.

Walking from Security Checkpoint 2 to gate D26 at SEA takes about 7 to 11 minutes, train included.

Walking from Security Checkpoint 2 to gate C20 at SEA takes about 7 to 10 minutes.

Walking from Security Checkpoint 2 to gate A21 at SEA takes about 5 to 8 minutes. How we work out times

Our walking times include the moving walkways at Concourse A and Concourse B.

Checked October 2026. Start points marked approximate are widened by 1 minute at the low end and 2 minutes at the high end.

Security checkpoints at SEA

Security Checkpoint 1, Main Terminal (Baggage Claim level)
Hours: see the airport's site. Gates A1 to S16.
Start point approximate.
Security Checkpoint 2, Main Terminal (Departures level)
Hours: see the airport's site. Gates A1 to S16.
Security Checkpoint 3, Main Terminal (Departures level)
Hours: see the airport's site. Gates A1 to S16.
Security Checkpoint 4, Main Terminal (Departures level)
Hours: see the airport's site. Gates A1 to S16.
Security Checkpoint 5, Main Terminal (Departures level)
Hours: see the airport's site. Gates A1 to S16.
Security Checkpoint 6, Main Terminal (Departures level)
Hours: see the airport's site. Gates A1 to S16.

Checkpoint names from portseattle.org, read 13 October 2026. Live wait times (airport site)

FAQ

How long does it take to get to N Gates at SEA?

From Security Checkpoint 2, 6 to 11 minutes to the nearest N Gates gate, N1, and 7 to 12 minutes to N18, train included.

Can you change concourses at SEA without leaving security?

Yes. Take the SEA Underground train or walk; you stay inside security.

Which terminal has the most airlines at SEA?

Terminal S, with 28 of the 36 airlines on the airport's list. Terminal B has 5.

How many gates does SEA have?

SEA has 103 gates in 1 terminal and 6 concourses (A, B, C, D, N and S).

Which checkpoint should I use at SEA?

Any of the 6 checkpoints leads to every gate, because the gates are connected inside security. Our times start at Security Checkpoint 2 unless the page says otherwise.

Sources and last checked

portseattle.org airline list, read 13 October 2026; checkpoint names and positions from portseattle.org, read 13 October 2026. Walkways from OpenStreetMap. Checked October 2026. How we work out times

Shops, food and lounges: see the airport's own map (portseattle.org).