SEAAirport Guide

Alaska Airlines at SEA: concourses and check-in

Alaska flies from Concourses C, D and N at SEA. Find check-in near Door 29, take the train to N, and see all three Alaska Lounges' hours.

A carry-on suitcase by a gate window at Seattle-Tacoma airport, with an aircraft at the jet bridge outside.
Gate window, SEA

Alaska uses Concourse C, Concourse D and Concourse N at SEA. Alaska check-in is on the Main Terminal ticketing level, Level 5, before security, near Door 29.

SEA has one Main Terminal, not a separate Alaska terminal. C and D join the terminal’s other main concourses on foot after security. N is a satellite concourse reached by the SEA Underground train. You don’t need to choose a concourse before you arrive, but you do need your flight’s gate before heading for N.

Arriving for an Alaska flight

Coming from the garage or light rail? The walkway from the Link station reaches the north end of garage Level 4, near Alaska Airlines. Alaska also has self check-in kiosks, bag tag stations and bag drops on Level 4 by Skybridges 5 and 6.

The Port of Seattle says to check in with the operating carrier. Use the Alaska Airlines listing for Alaska’s check-in area, or the airline directory if another carrier operates your flight.

The Port of Seattle says you can reach every gate from any checkpoint. Checkpoints 5 and 6 are closest to C, D and N. Our checkpoint listings give Checkpoint 5 hours of 4 a.m. to 8 p.m., with TSA PreCheck. They give Checkpoint 6 hours of 4 a.m. to 10 p.m., with TSA PreCheck, Touchless ID for participating airlines, CLEAR General and PreCheck screening, and a premium lane for participating airlines. After those checkpoints close, Checkpoint 4 remains open 24 hours. Our security page lists every checkpoint and its published hours.

Find your gate after security

The Alaska Airlines listing doesn’t assign a particular route or flight to one concourse. Use your displayed gate letter to choose a row below.

Your gate starts with Where to go
C Follow signs for C Concourse.
D Follow signs for D Concourse.
N Follow signs for the SEA Underground Green Line. Board at C Station by Gate C11 or D Station across from Gate D2, then get off at N Station.

The Green Line arrives every three minutes. If the train is out of service, take the bus to N.

Alaska Lounges at SEA

All three Alaska Lounges are past security. If your gate is at N, take the Green Line back after visiting the C lounge or D lounge.

Lounge Where to find it Listed hours
Alaska Lounge, C Near Gate C16A Daily, 5 a.m. to 7 p.m.
Alaska Lounge, D Near Gate D1 Daily, 5 a.m. to 11 p.m.
Alaska Lounge, N Mezzanine above Gate N15 Daily, 5 a.m. to 11 p.m.

Check the linked Alaska Lounge listings for admission rules and any walk-in price before making a detour.

Sources