Transportation is the defining characteristic of SeaTac. The city is anchored by **Seattle-Tacoma International Airport (SEA)**, the largest airport in the Pacific Northwest, handling tens of millions of passengers and extensive cargo operations annually.
Public transit is highly developed. The Sound Transit **Link Light Rail** runs directly through the city, with two major stations: the SeaTac/Airport Station and the Angle Lake Station. These stations provide rapid, reliable connections to downtown Seattle, the University of Washington, and beyond.
Major roadways include Interstate 5 (forming the eastern border), State Route 99 (known locally as International Boulevard, serving as the main commercial spine), and State Route 518 (connecting Burien to Tukwila). King County Metro provides extensive bus service, including the RapidRide A Line, which offers frequent service along International Boulevard. Sidewalks and bicycle infrastructure are continually being improved, particularly in the transit-oriented development zones near the light rail.