Seattle-Tacoma International Airport (Usa) – Location, Geography, Facts

Seattle-Tacoma International Airport is an international airport in the United States.

Seattle-Tacoma International Airport, Usa.

Country: Usa
Coordinates: 47.4489° N, 122.3094° W

Seattle-Tacoma International Airport overview

Seattle-Tacoma International Airport is an international airport in the United States. It is located in the city of SeaTac, Washington, between the central cities of Seattle and Tacoma, and it has three parallel runways as a quantifiable operational footprint. The airport functions as the primary air gateway for the central Puget Sound region and occupies a purpose-built complex of airfield, terminal, and support facilities organized around a multi-concourse terminal spine.

Seattle-Tacoma International Airport coordinates

Seattle-Tacoma International Airport is commonly mapped at approximately 47.4489° N, 122.3094° W, or 47.4489, -122.3094 in decimal degrees.

Degrees: 47.4489° N, 122.3094° W

Decimal: 47.4489, -122.3094

Where Seattle-Tacoma International Airport is located

Seattle-Tacoma International Airport sits within the municipal boundaries of SeaTac in King County, Washington, on a low-lying plain near the eastern margin of Puget Sound. The airport’s approximate geographic coordinates are 47.4502° N, 122.3088° W, and its field elevation is about 433 feet (132 metres) above mean sea level. Surrounding municipalities include Tukwila, Burien and Des Moines, and the site lies on terrain shaped by glacial outwash and coastal sedimentation within the greater Duwamish–Green River watershed.

Why Seattle-Tacoma International Airport is important

Seattle-Tacoma International Airport matters as the principal aviation hub for the Pacific Northwest, concentrating passenger and air-freight movements that support regional commerce and international connections. Its combination of a high-capacity terminal complex, multiple parallel runways, and concentrated cargo handling facilities distinguishes it among U.S. West Coast airports. The airport’s role in facilitating transoceanic cargo and passenger services and in integrating air transport into the region’s logistics network provides measurable economic and infrastructural significance beyond local transport needs.

History of Seattle-Tacoma International Airport

The airport site was developed for aviation during the mid-20th century to replace dispersed municipal and airfield facilities that could not accommodate larger postwar aircraft and growing commercial demand. Early development emphasized runway construction on engineered fill and the erection of a central passenger terminal to consolidate airlines. Over ensuing decades the airfield expanded with additional runways, apron areas and satellite concourses, while terminal buildings underwent phased modernization to increase gate capacity and support international processing. Funding and patronage came from county authorities and later port management, with federal aviation programs contributing to major airfield and navigational upgrades.

Natural features of Seattle-Tacoma International Airport

Architecturally, the terminal complex combines a linear headhouse with projecting concourse piers and extensive glazed curtain walls supported by steel trusses and reinforced concrete piers. Pavement on runways and taxiways uses structural concrete overlays and engineered asphalt surfacing designed for heavy commercial aircraft. The control tower rises as a distinct vertical element with a concrete shaft and glazed cab, and apron areas include large concrete hardstandings and precision-marked taxi corridors. Geologically, the site’s engineered fills and compacted glacial outwash require comprehensive subsurface drainage and foundation treatment beneath heavy terminal and pavement structures.

Environment, protection, and monitoring of Seattle-Tacoma International Airport

Seattle-Tacoma International Airport is owned and operated under a port authority governance model subject to federal aviation regulation and environmental law. Long-term management includes an airport master planning process, stormwater treatment systems, wetland mitigation projects and fish-habitat restoration measures in adjacent waterways. Noise monitoring networks and operational mitigation measures form part of the airport’s stewardship programs, and ongoing infrastructure investments are planned to meet regulatory, environmental and resilience objectives over multi-decade horizons.

Seattle-Tacoma International Airport facts

Seattle-Tacoma International Airport’s IATA code is SEA and its ICAO code is KSEA.
Alaska Airlines maintains its corporate headquarters adjacent to the airport in the city of SeaTac.
The facility was originally established as a county-operated airfield during the mid-20th century under local government auspices.
The airport’s terminal complex uses a central passenger concourse with discrete satellite piers to separate domestic and international processing functions.
A municipal ballot initiative affecting airport-area wages brought national attention to labor and economic policy debates connected to the airport.

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