Washington Dulles International Airport (IATA: IAD, ICAO: KIAD) is a public airport located 25 miles (40 km) west of the central business district of Washington, D.C., in Dulles, Virginia. It serves the greater Washington, D.C. metropolitan area.

In 2011 Dulles saw 23.2 million passengers through the airport. On April 17, 2012, the Space Shuttle orbiter "Discovery" was ferried to Dulles mounted to a NASA 747 to be decommissioned and displayed in the Steven F. Udvar-Hazy Center.

The airport occupies approximately 11,000 acres (17.19 mi²/ 44.5 km²) of land 26 miles (41.8 km) west of downtown Washington, straddling the border of Fairfax County and Loudoun County, Virginia. It is located partly in Chantilly and partly in Dulles, west of Herndon and southwest of Sterling. In 1958, the village of Willard was torn down to make room for Dulles, and countless roads, homes, stores, and schools were demolished to make room for runways, concourses and other features.