List of Airlines at SEA Airport

At Seattle–Tacoma International Airport (SEA), airline check-in desks are centrally located on the Ticketing Level of the Main Terminal. After clearing TSA security screening, travelers reach their respective concourses on foot or via the automated SEA Underground train system.

Concourse A

Accommodates domestic and international departures with Delta Air Lines and United Airlines.

• Delta Air Lines – Major hub operating over 50 destinations including key long-haul routes (Amsterdam, Seoul, Tokyo, London, Cancun, Hawaii).
• United Airlines – Flights to Denver, San Francisco, Chicago-O'Hare, Houston, Newark, Washington-Dulles.

Concourse B

Mainly utilized by low-cost carriers, regional flights, and select Delta departures.

• Delta Air Lines – Additional domestic connections.
• Frontier Airlines – Domestic flights to Denver, Las Vegas, Phoenix, and more.
• Southwest Airlines – Direct flights to Las Vegas, Denver, Oakland, Phoenix, Chicago-Midway, and others.

Concourse C

Exclusively dedicated to Alaska Airlines flights.

• Alaska Airlines – Primary hub serving more than 100 direct destinations across North America, Hawaii, Mexico, Costa Rica, and the Caribbean.

Concourse D

Operated by Alaska Airlines and American Airlines.

• Alaska Airlines – Domestic flights and select regional connections.
• American Airlines – Nonstop service to Dallas/Fort Worth, Charlotte, Chicago-O'Hare, Miami, Philadelphia, and Phoenix.

North Satellite (Concourse N)

Modernized satellite facility serving as an expanded hub concourse for Alaska Airlines.

• Alaska Airlines – Domestic and regional operations.

South Satellite (Concourse S)

Handles the majority of international long-haul operations alongside transborder services.

• Aer Lingus – Dublin.
• Aeroméxico – Mexico City.
• Air Canada – Vancouver, Toronto, Montreal.
• Air France – Paris-Charles de Gaulle.
• All Nippon Airways (ANA) – Tokyo-Haneda.
• Asiana Airlines – Seoul-Incheon.
• British Airways – London-Heathrow.
• Cathay Pacific – Hong Kong.
• China Airlines – Taipei-Taoyuan.
• Condor – Frankfurt.
• Emirates – Dubai.
• EVA Air – Taipei-Taoyuan.
• Finnair – Seasonal service to Helsinki.
• Hainan Airlines – Beijing, Chongqing.
• Hawaiian Airlines – Honolulu, Kahului.
• Icelandair – Reykjavik-Keflavik.
• Japan Airlines – Tokyo-Narita.
• JetBlue Airways – Boston, New York-JFK.
• Korean Air – Seoul-Incheon.
• Lufthansa – Frankfurt, Munich.
• Qatar Airways – Doha.
• Singapore Airlines – Singapore.
• STARLUX Airlines – Taipei.
• Turkish Airlines – Istanbul.
• Virgin Atlantic – London-Heathrow.
• Volaris – Guadalajara.
• WestJet – Calgary, Edmonton.

Other Operations

• Sun Country Airlines – Domestic flights to Minneapolis/St. Paul.
• Air Mobility Command (AMC) – Military/official charter flights to bases in Japan and South Korea (pre-security counters next to Checkpoint 2).