Seattle–Tacoma International Airport is the hub of Alaska Airlines and Delta's Pacific Northwest gateway. On a clear day the view from the terminal takes in Mount Rainier to the south and the Olympic Mountains to the west. The current schedule feed lists 157 airports in 26 countries connected to Seattle.
It is also the airport closest to Boeing's Puget Sound factories, so brand-new aircraft in primer or unfamiliar liveries are a common sight on the ramp.
Seattle Tacoma International Airport is the 37th busiest airport in the world — it handled 52,715,181 passengers in 2025, according to ACI World's annual ranking.
The most frequently served routes for Seattle Tacoma International Airport connect to San Francisco (SFO), Los Angeles (LAX) and Portland (PDX).
The longest connected route for Seattle Tacoma International Airport reaches Singapore (SIN). This non-stop flight covers a distance of 8,065 miles (12,979 km).