Boeing Field/King County International Airport Seattle is the primary airport serving Seattle, Washington and King County, Washington. The airport covers an area of 2,000 acres (809 ha) and has two runways: 12/30 is 9,000 feet long and 5,000 feet wide (2,438 m × 1,524 m) and 18/36 is 6,000 feet long and 3,000 feet wide (1,829 m × 1,008 m). In fiscal year 2016 the airport had 68,508 aircraft operations, an increase of 2.5% from 65,859 in 2015.

The Snohomish County Airport (IATA: PSK, ICAO: KPSK) is a public airport three miles southeast of downtown Everett, in Snohomish County, Washington. The airport serves the general aviation community in the Seattle metropolitan area. It is included in the National Plan of Integrated Airport Systems for 2011–2015, which categorized it as a "general aviation" facility.

The airport covers an area of 547 acres (220 ha) at an elevation of 324 feet (99 m) above mean sea level. It has one runway designated 8/26 with an asphalt surface measuring 4,000 by 75 feet (1,219 x 23 m).

Sea-Tac Airport is one of the busiest airports in the United States, handling more than 43 million passengers annually. The airport has two terminals: the International Terminal which services international flights and the domestic Terminal which services domestic flights. The airport's three runways are also among the longest in North America.