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Seattle Airport (SEA)

Seattle-Tacoma Airport (SEA) is one airport with six security checkpoints, and you can reach every gate from any of them. Thirty-seven airlines serve it, most of the international ones in the S Concourse. Checkpoint 4 is open 24 hours and has the family lane, and the Link light rail station is at the airport.

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Updated 21 October 2026

The terminals at Seattle Airport

Seattle-Tacoma International Airport works as one airport, and the gates are in areas A and S, B and C, and D and N. The security checkpoints are numbered 1 to 6, and you can reach all the gates from any one of them:

  • Checkpoints 1, 2 and 3 are the closest to the A and S gates. Checkpoint 3 is open from 4 AM to 11:30 PM, and checkpoints 1 and 2 close earlier.
  • Checkpoint 4 is the closest to the central terminal and the B and C gates, and it is open 24 hours.
  • Checkpoint 5 is the closest to the C, D and N gates, and checkpoint 6 is closest to the C, D and N gates too, open from 4 AM to 10 PM.

The airport publishes the printable directories and the full-screen map, and the flySEA app shows the step-by-step directions and translates the map into Spanish and other languages.

The airport's own airlines page says that 37 airlines serve SEA Airport, to 96 nonstop domestic and 36 international destinations. Most of the international airlines fly from the S Concourse: Aer Lingus, AeroMexico, Air Canada, Air France, ANA, Asiana Airlines, British Airways, Cathay Pacific, China Airlines, Condor, Emirates, EVA Air, Finnair, Hainan Airlines, Hawaiian Airlines, Icelandair, Japan Airlines, JetBlue Airways, Korean Air, Lufthansa, Philippine Airlines, Qatar Airways, SAS, Singapore Airlines, STARLUX Airlines, Turkish Airlines, Virgin Atlantic and Volaris.

The other airlines of the airport's own list are Delta Air Lines and WestJet, from the A and B Concourses, Alaska Airlines, from the C, D and N Concourses, American Airlines, from the D Concourse, and Frontier Airlines, Southwest Airlines and United Airlines, from the B Concourse. The page also lists Air Mobility Command and Sun Country Airlines, which ask you to check your boarding pass, and it warns that a flight can be operated by a partner airline, so check in with the one that actually flies it.

Getting to and from Seattle Airport

The Link light rail trains arrive and depart on the platform level of the station at the airport. A free shuttle runs from the station to the centre of the parking garage, every day of the week from 5 AM to midnight.

The airport's own pages also cover the public buses, the taxis, the rental cars, the door-to-door shuttle, the hotel courtesy shuttles and the on-demand rides, and they warn not to park on the shoulders of the Airport Expressway, which is illegal and dangerous.

What happens when you arrive at SEA

Keep your passport and any form you filled in on the plane with you the whole way, from the aircraft door to the exit.

The hours of the security checkpoints and the types of screening are approximate and change with the operations of the day, so the airport asks you to look at the digital signs inside the terminal to see which checkpoints are open and what each one offers.

Seattle Airport with children

Checkpoint 4, the one that is open 24 hours and closest to the central terminal, has a family lane, so you can go through it with the children whatever the hour. All the checkpoints are accessible, and for extra help you should contact TSA Cares 72 hours before the flight.

Leave the passports and the children's documents in your carry-on bag, not in the checked luggage, so you have them at passport control. And the airport's own tip for the drive is worth following: if you need a short free stop, use the Cell Phone Lot.

Plan your stop at Seattle Airport

The airport is being modernized and publishes the traveler alerts and the impacts on its home page, so read them before you travel. And check with the embassy or consulate about the documents your family needs for the entry rules of every country on your route.

Sources

Frequently asked questions

How many security checkpoints does Seattle Airport have?

Six, numbered 1 to 6, and every gate is reachable from any of them. Checkpoints 1, 2 and 3 are closest to the A and S gates, checkpoint 4 to the central terminal and the B and C gates, and checkpoints 5 and 6 to the C, D and N gates.

Which Seattle Airport checkpoint is open 24 hours?

Checkpoint 4, the one closest to the central terminal and the B and C gates. It also has the family lane.

How do I get from Seattle Airport to the city by train?

The Link light rail station is at the airport, with the trains on the platform level. A free shuttle runs from the station to the centre of the parking garage every day from 5 AM to midnight.

Is there a family lane at the Seattle Airport security?

Yes, at Checkpoint 4, which is open 24 hours. All the checkpoints are accessible, and for extra assistance you should contact TSA Cares 72 hours before the flight.

What do I do first when I land at SEA?

Keep your passport and any form you filled in on the plane with you the whole way, from the aircraft door to the exit, and look at the digital signs inside the terminal to see which checkpoints are open.

Which airlines fly from Seattle Airport?

Thirty-seven airlines serve SEA Airport. Most of the international ones fly from the S Concourse: Aer Lingus, AeroMexico, Air Canada, Air France, ANA, Asiana Airlines, British Airways, Cathay Pacific, China Airlines, Condor, Emirates, EVA Air, Finnair, Hainan Airlines, Hawaiian Airlines, Icelandair, Japan Airlines, JetBlue Airways, Korean Air, Lufthansa, Philippine Airlines, Qatar Airways, SAS, Singapore Airlines, STARLUX Airlines, Turkish Airlines, Virgin Atlantic and Volaris. Delta Air Lines and WestJet fly from the A and B Concourses.