
Seattle is served by two airports: Seattle–Tacoma International Airport and King County International Airport-Boeing Field. Seattle–Tacoma International Airport is located in King County, Washington State. It is the primary gateway to Seattle and Tacoma and is owned and operated by the Port of Seattle. King County International Airport-Boeing Field is located four miles south of downtown Seattle and is one of the busiest non-hub airports in the nation.
| Characteristics | Values |
|---|---|
| Name | Seattle–Tacoma International Airport |
| IATA Code | SEA |
| Location | Four miles south of downtown Seattle |
| Owner | The Port of Seattle |
| Counties | King County |
| Nearby cities | Des Moines, Burien, Federal Way, Tukwila, Normandy Park |
| Bus service | King County Metro |
| Rail service | Sound Transit's Link light rail system |
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What You'll Learn

Seattle-Tacoma International Airport
The airport has experienced substantial growth, with the busiest day for outbound passengers recorded on July 24, 2023, surpassing the previous record set in 2019. This growth has prompted the Port of Seattle to invest over $2 billion in expansion and renovation projects. One such project involves a $320.4 million unified, high-speed baggage system to enhance efficiency and address the limitations of the current system.
The history of Seattle-Tacoma International Airport includes community opposition to expansion plans in the 1970s and 1990s due to concerns over noise, environmental impact, and other issues. The Port and King County government adopted the Sea-Tac Communities Plan in 1976 to address these concerns, leading to noise reduction programs and the purchase of nearby properties for soundproofing and noise mitigation.
The airport is conveniently accessible via the Link light rail system, with the SeaTac/Airport station providing easy connections to downtown Seattle and the University of Washington. The station is connected to the airport terminal by a pedestrian bridge, and the airport is also served by bus services, including the King County Metro bus system and Sound Transit regional express buses, offering routes to various destinations in the region.
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King County International Airport
The airfield is named after William E. Boeing, the founder of Boeing. It was constructed in 1928 and served as Seattle's primary airport until the opening of the Seattle-Tacoma International Airport ("Sea-Tac") in 1944. The Seattle-Tacoma International Airport is located about five miles south of Boeing Field in the city of SeaTac and is the region's main passenger airport.
The airport is easily accessible via various transportation options. It is connected to the Link light rail system, with frequent service to downtown Seattle and the University of Washington. Additionally, the King County Metro bus system and Sound Transit regional express buses provide connections to surrounding areas. The airport is also conveniently located for hosting celebrities, dignitaries, and sports teams due to its proximity to the city centre.
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Airport noise and local opposition
Seattle-Tacoma International Airport is located in King County, Washington State. The airport is owned and operated by the Port of Seattle.
The Seattle-Tacoma International Airport has been a source of noise complaints and local opposition for decades. As early as the 1970s, residents of the surrounding area filed lawsuits against the Port of Seattle, citing issues such as noise, vibration, and smoke. In response, the Port and the King County government adopted the Sea-Tac Communities Plan in 1976 to address these concerns and guide future development. As part of this plan, the Port spent over $100 million to buy and soundproof homes and school buildings in the vicinity of the airport.
In the 1980s, the airport participated in the airport noise-compatibility program initiated by Congress in 1979, which involved developing airport-noise contours, purchasing real estate, and retrofitting homes for noise mitigation. Despite these efforts, noise continued to be a significant issue for nearby communities. In the early 2000s, there was opposition to the construction of a third runway at the airport, with community members, local governments, and the Highline School District expressing their concerns. A lawsuit was filed against the Port of Seattle by opponents of the runway, but it was ultimately dropped in 2004.
To address ongoing noise concerns, the Port of Seattle's Noise Programs Office works closely with the Federal Aviation Administration (FAA), airlines, and local communities to monitor existing noise programs and develop new ways to reduce airport and aircraft noise. The office focuses on sound insulation and noise abatement programs, and the Port operates a system of 24 noise monitors throughout the greater Seattle area to understand the impacts of aircraft noise on surrounding communities. Additionally, the airport has implemented noise abatement flight procedures, which involve specific flight headings and altitudes designed to minimize noise.
Despite these efforts, noise from the airport continues to be a concern for nearby residents, as evidenced by the ongoing work of the Noise Programs Office and community activists like Steve Edmiston. The airport's growth and expansion, fueled by the expansion of airlines such as Alaska Airlines and Delta Air Lines, have likely contributed to the persistence of noise issues.
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Expansion and renovation projects
Seattle-Tacoma International Airport, also known as Sea-Tac Airport, has undergone various expansion and renovation projects over the years to accommodate growing passenger traffic and improve the overall customer experience.
One significant project was the addition of a third runway, which was completed in 2008 at a construction cost of $1.1 billion. The planning for this project began in the early 1990s, when it was determined that a third runway was necessary to handle increasing air traffic in the region. The new runway is parallel to the existing two and is located 2,500 ft (760 m) west of runway 34R, enabling landings on both during times of low visibility.
Another notable expansion plan is the Sustainable Airport Master Plan, which proposes an expansion on the north side of Sea-Tac, adding 19 additional gates. This plan, currently under review, would increase the airport's capacity to around 56 million passengers a year, addressing the strain on the airport's facilities due to the growth of airlines such as Seattle-based Alaska Airlines and Delta Air Lines' hub at the airport.
To enhance the customer experience, Sea-Tac Airport has also invested in renovating its Central Terminal. The $21.8 million renovation added 11,000 square feet of dining and seating options, including Salty's at the SEA, BrewTop Social, and a Centurion Lounge by American Express. The renovation also improved ADA accessibility and restored the iconic glass wall, providing stunning views of the airfield. The Central Terminal Renovation Project was completed in Q1 2023, with a celebration that included live music and remarks from SEA leadership.
In addition to these projects, Sea-Tac Airport is in the midst of a $5 billion multi-year upgrade program that includes wider access roads, modernised baggage handling, new restrooms, and additional floors on the C concourse. These upgrades aim to smooth passenger flows and reduce security line wait times. The airport's unique challenge is that, unlike larger airports, it cannot close off areas during construction, so careful orchestration is required to ensure a successful building process while minimising disruption to passengers.
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Airlines and destinations
Seattle–Tacoma International Airport, also known as Sea-Tac Airport, is located in the city of SeaTac, Washington State, approximately 14 miles (23 km) south of downtown Seattle. It is the primary international airport serving Seattle and its surrounding metropolitan area. As of 2022, 31 airlines operate at Sea–Tac, serving 91 domestic and 28 international destinations across North America, Oceania, Europe, the Middle East, and Asia.
Sea-Tac is the primary hub for Alaska Airlines, whose headquarters are near the airport. The airline has fuelled much of the airport's growth, alongside Delta Air Lines, which has established a major international hub at the airport since 2011. Japan Airlines also operates at Sea-Tac, having become the airport's first international carrier in 1959 with flights to Tokyo.
Other airlines that have served the airport include Northwest Airlines, which operated the airport's first commercial flights in 1945, and Western Airlines, which, along with Northwest Airlines, operated the first scheduled commercial flights in 1947. By 1951, United, Alaska, Trans-Canada, Western, and Pan Am had joined these airlines, departing from Boeing Field. Today, passengers can fly to 134 destinations with 38 airlines in scheduled passenger traffic.
The airport is easily accessible via the Link light rail system, with frequent service to downtown Seattle and the University of Washington, as well as the King County Metro bus system and Sound Transit regional express buses.
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Frequently asked questions
Seattle Airport, or Seattle-Tacoma International Airport, is in King County, Washington State.
The IATA code for Seattle Airport is SEA.
The busiest day for outbound passengers at Seattle Airport was 24 July 2023, with 73,651 passengers.
The light rail system that serves Seattle Airport is the Link light rail system.
The nearest non-hub airport to downtown Seattle is King County International Airport, which is four miles south of the city.








































