Welcome to Seattle-Tacoma International Airport (SEA), known as Sea-Tac! Located 13 miles south of downtown Seattle, it’s the largest airport in the Pacific Northwest and a major hub for Alaska Airlines and Delta Air Lines. Sea-Tac has three runways, a central terminal with four concourses, and two satellite terminals linked by an underground train. Seattle is also famously the home of Boeing, with strong aviation ties that shape the region’s global reputation.