SEA · Seattle · Terminal Concourse C/D/N
Alaska Airlines Check-in at Seattle-Tacoma International Airport
Alaska Airlines departs from Terminal Concourse C/D/N at Seattle-Tacoma International Airport. Online check-in opens 24h before departure.
Alaska Airlines check-in rules at SEA
Step-by-step at Seattle-Tacoma International Airport
-
Check in online
Open the Alaska Airlines app or website 24 hours before departure. Save the boarding pass to your phone wallet.
-
Arrive at Terminal Concourse C/D/N
Alaska Airlines flights at SEA depart only from Terminal Concourse C/D/N. Allow 120 minutes from arrival to gate.
-
Drop off bags at Main Terminal main hall
Bag-drop 3 hours before departure, closes 40 minutes before departure. Self-service kiosks available.
-
Clear security
Submit your wait time on the airport page above to help others. Standard liquids rule: 100 ml in a single transparent bag.
-
Walk to gate Concourses C, D, N (satellite)
Allow 5–20 minutes from security to your gate. Boarding starts 30 minutes before departure; gate closes 15 minutes before.
Boarding Alaska Airlines at SEA
Terminal Concourse C/D/N notes
-
Typical gates
Alaska Airlines flights typically depart from gates Concourses C, D, N (satellite).
-
Walk time
Expect 5–20 minutes from security to the furthest gate.
-
Eat & shop
Main Terminal has Pacific Northwest + international food (Beecher's Cheese, Sub Pop record store, Anthony's HomePort), local coffee (Caffe Vita, Tom Douglas).
-
Lounges
Alaska Lounge (First + MVP Gold 100K + MVP Gold). Modern, spacious lounge with PNW cuisine. Three locations across Main Terminal + N satellite.
-
Family / accessibility
Family priority lane. Stroller drop at gate. Alaska Airlines offers free seat selection together for families when booking.
Known issues at SEA with Alaska Airlines
Hawaiian Airlines integration ongoing
Problem: Alaska's 2024 acquisition of Hawaiian Airlines is still integrating. Some routes co-operated; loyalty programs merging.
Solution: MileagePlan + HawaiianMiles unified by 2026. App handles both during transition. Verify operating airline on bookings.
N Satellite needs underground tram
Problem: Alaska Airlines uses N Satellite Terminal at SEA — accessed only by underground people-mover (1.5 min ride from Main Terminal).
Solution: Allow 15 min for N satellite gates. Tram runs every 90 sec. Don't miss — only one stop, no walking option.
Estimate your EU 261 compensation
Flights to/from the EU, delayed 3+ hours or cancelled with less than 14 days' notice, are eligible for €250–€600 in compensation. Check your eligibility in 60 seconds: