Long before airplanes and freeways, the area that is now SeaTac was inhabited by Coast Salish peoples, specifically the Duwamish tribe, who utilized the forested plateau and nearby waterways for hunting, foraging, and travel.
European-American settlement began in the late 19th and early 20th centuries, as pioneers established small farming communities and logging operations in what was broadly known as the Highline area. For decades, the region remained a quiet, rural collection of unincorporated communities. The turning point came during World War II. In 1944, the Port of Seattle began constructing the Seattle-Tacoma International Airport to serve as a civilian alternative to Boeing Field, which the military had requisitioned. The airport opened to commercial flights in 1947, forever altering the landscape and economy of the area.
As the airport expanded over the decades, the surrounding unincorporated neighborhoods—such as Bow Lake, Riverton, and McMicken Heights—grew rapidly into suburban residential and commercial zones. However, the relentless expansion of the airport brought increasing concerns regarding noise, traffic, and land use. Frustrated by a lack of local control and representation in King County, residents voted to incorporate in 1989. The City of SeaTac officially incorporated on February 28, 1990.
In 2013, SeaTac made modern history when voters narrowly passed Proposition 1, a landmark measure that established a $15 minimum wage and mandated paid sick leave for thousands of airport, hotel, and rental car workers. This grassroots victory served as a catalyst for the national "Fight for $15" movement.