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Washington Dulles International Airport
IATA: IAD, ICAO: KIAD, FAA

An international airport in the Eastern United States, located in Loudoun County and Fairfax County in Virginia, 26 miles (42 km) west of Downtown Washington, D.C.

Dulles is a major hub for domestic and international air travel with a mixture of legacy and low fare carriers that provide air service throughout the world. Flights operate from midfield concourses A, B, C and D and from Z-gates connected to the Main Terminal.

This airport has the most international passenger traffic of any airport in the Mid-Atlantic outside the New York metropolitan area, including approximately 90% of the international passenger traffic in the Baltimore–Washington region. The airport is considered the region's international air hub, with dozens of nonstop international flights.

The current four-runway configuration has a capacity of up to 600,000 aircraft operations per year. With a future fifth runway constructed, the airfield capacity could increase to 1 million aircraft operations per year.