Seattle-Tacoma International Airport (SEA), commonly known as Sea-Tac, is the primary commercial airport serving the greater Seattle metropolitan area and the primary hub for Alaska Airlines. Located between Seattle and Tacoma in King County, Washington, SEA connects the Pacific Northwest to domestic destinations across the United States and to international routes spanning the Pacific Rim, Europe, and beyond.
Seattle-Tacoma International Airport is organized around a central main terminal building with two satellite concourses — the North Satellite and South Satellite — connected to the main terminal via underground pedestrian tunnels equipped with moving walkways. A third concourse, the C Concourse, is accessible airside from the main terminal without a tunnel connection.
Alaska Airlines is the dominant carrier at SEA, using the airport as its global headquarters hub and largest base of operations. Delta Air Lines is the second-largest carrier. The combination of Alaska's domestic network and Delta's international connections makes SEA an exceptionally well-connected airport for a city of Seattle's size.
SEA serves as the primary international gateway for the Pacific Northwest, with nonstop service to Asia-Pacific destinations including Tokyo, Seoul, Osaka, Shanghai, Beijing, Hong Kong, Taipei, Sydney, Auckland, and Vancouver. Transatlantic service to London, Amsterdam, Frankfurt, and other European cities operates seasonally. The airport handles more than 50 million passengers annually in high-volume years.
Seattle-Tacoma International Airport opened in 1949, replacing Boeing Field as the region's primary commercial aviation facility. The airport was built on a plateau between Seattle and Tacoma to serve both cities, which gives it its hyphenated name. The site was selected for its favorable terrain and weather characteristics relative to alternatives closer to Puget Sound.
The airport grew steadily through the jet age and expanded significantly in the 1970s with the construction of the North and South Satellites. Alaska Airlines, which was incorporated in Alaska and later based in Seattle, grew from a small regional carrier to one of the largest U.S. airlines and established SEA as its hub, giving the airport a dominant carrier much earlier than many comparable-sized airports. The Link Light Rail connection from downtown Seattle opened in 2009, fundamentally improving SEA's ground transportation options.
SEA's main terminal contains ticketing, check-in, and baggage claim for all airlines. Security checkpoints lead to the main terminal's own gates (primarily Alaska Airlines domestic operations) and to tunnels accessing the North and South Satellites.
The North Satellite serves Alaska Airlines' international operations and additional domestic gates. The South Satellite houses Delta Air Lines, United Airlines, and several other carriers. The C Concourse, accessible from the main terminal airside, handles various domestic and charter operations. Alaska Airlines uses gates across multiple areas, reflecting its outsized share of the airport's operations.
Link Light Rail's Sea-Tac/Airport Station is located at the south end of the main terminal and is accessed via a pedestrian walkway from the baggage claim level.
Alaska Airlines is by far the largest carrier at SEA, operating domestic service to cities across the United States and international routes to Mexico and Canada. Delta Air Lines is the second-largest carrier, operating domestic and international routes including transatlantic service. United Airlines has a significant presence as well.
Among international carriers, several Asian airlines serve SEA nonstop, including All Nippon Airways (ANA), Japan Airlines, Korean Air, Asiana Airlines, Air China, Hainan Airlines, and Cathay Pacific. Air Canada, WestJet, and other Canadian carriers serve trans-border routes. British Airways and KLM serve European routes. SEA provides nonstop access to more than 90 destinations.
SEA offers a strong selection of dining and retail with a distinct Pacific Northwest character. Local Seattle restaurant brands are well-represented throughout the concourses, and the airport has a reputation for above-average food options compared to many U.S. airports. Alaska Airlines Lounge locations are found in multiple areas of the terminal. Delta Sky Club operates in the South Satellite. Free Wi-Fi is available throughout.
The airport features public art installations, a meditation and yoga room, and a range of family-friendly amenities. The Link Light Rail access level is well-signed and efficient. Nursing rooms and pet relief areas are available in each concourse area.
Sea-Tac is directly served by Sound Transit's Link Light Rail at the Sea-Tac/Airport Station. The 1 Line runs from the airport to downtown Seattle (Westlake Station) in approximately 38 minutes and continues to the University of Washington and the northern suburbs. The light rail runs from approximately 5 AM to midnight on weekdays and has reduced hours on weekends. A one-way trip from the airport to downtown costs a few dollars.
Rideshare services operate from the 3rd floor of the parking garage on the Arrivals level. Taxis and car services pick up on the ground floor. The Rental Car Center is an off-airport facility accessible via the free Rental Car Center shuttle. I-5 provides direct highway access to both Seattle and Tacoma.
SEA provides parking in a large multi-level garage adjacent to the main terminal, plus economy surface lots accessible via shuttle. The garage offers short-term parking closest to the terminal at the highest rates, with long-term options on outer levels. Due to Seattle's traffic and the convenience of the Link Light Rail, many travelers opt for transit over driving and parking, particularly for trips from the city center.
Off-airport parking operators in SeaTac and neighboring cities offer competitive rates with shuttle service to the terminal. Reservations are recommended during peak summer travel periods and holiday weekends.
The Link Light Rail from downtown Seattle to Sea-Tac is one of the best airport rail connections in the United States — fast, reliable, and inexpensive. If you are traveling from the Capitol Hill, First Hill, University District, or downtown Seattle neighborhoods, the train is typically faster and more predictable than driving during rush hour. Trains run frequently during peak hours.
When connecting between the North and South Satellites at SEA, passengers must travel through the underground tunnel — allow 15–20 minutes for this walk. The South Satellite can be a long walk from some main terminal gates. SEA's main terminal can be crowded during morning departure banks, and security lines can extend to the departures level — arrive early during peak periods.
Seattle-Tacoma International Airport is the economic gateway for one of the most dynamic metropolitan economies in the United States. The Seattle region is home to Amazon, Microsoft, Boeing, and dozens of major technology and aerospace companies, and SEA serves as the travel infrastructure supporting this corporate sector. The airport supports hundreds of thousands of jobs in the Puget Sound region and generates tens of billions in annual economic output.
Alaska Airlines' headquarters and hub at SEA make the airport especially central to the regional economy — the airline is one of the largest private employers in the area. SEA's strong Asia-Pacific connections support international trade and business travel for the Pacific Northwest's export-oriented economy, particularly in aerospace, agriculture, and technology.
SEA is implementing a major capital improvement program including an expanded International Arrivals Facility (IAF) to handle growing international passenger volumes. Additional projects include terminal modernization, expanded concourse capacity, and improvements to the Link Light Rail station interface. Sound Transit is extending the Link Light Rail network, which will improve connectivity to more Seattle neighborhoods and the broader region. The Port of Seattle is also pursuing sustainability initiatives targeting carbon-neutral airport operations.
SEA is a primary international gateway and major hub for West Coast travel. It connects the Pacific Northwest to domestic destinations nationwide and serves as the primary U.S. departure point for many transpacific routes.
Airports within approximately 60 miles of Seattle-Tacoma International Airport that may provide additional scheduled commercial, regional access.
Seattle-Tacoma International Airport is the Pacific Northwest's gateway to the world — a well-run, conveniently located airport with excellent rail access, strong Asia-Pacific connections, and the operational efficiency of Alaska Airlines' home hub. For travelers in the Seattle region, SEA offers outstanding connectivity relative to the city's size, and the Link Light Rail makes it one of the most transit-accessible major airports on the West Coast.
Take Sound Transit's Link Light Rail (1 Line) from Sea-Tac/Airport Station, located at the south end of the main terminal. Trains run to downtown Seattle's Westlake Station in approximately 38 minutes. The station is accessed via a walkway from the baggage claim level.
Alaska Airlines is the dominant carrier at SEA and operates it as its primary global hub. Alaska uses gates throughout the main terminal, North Satellite, and International Arrivals Facility.
Yes — SEA has some of the strongest Asia-Pacific connections of any West Coast U.S. airport. Nonstop routes serve Tokyo, Seoul, Osaka, Shanghai, Hong Kong, Taipei, Beijing, Sydney, Auckland, and other cities.
The North and South Satellites are connected to the main terminal via underground pedestrian tunnels with moving walkways. The tunnels are free and accessible from the secure side. Allow 10–20 minutes to walk between satellites.
For the most current flight schedules, parking availability, terminal maps, and ground transportation updates, visit the official Seattle-Tacoma International Airport website.
Seattle-Tacoma International Airport Official Site