Which airport code corresponds to Washington Dulles, DC?

The airport code that corresponds to Washington Dulles International Airport is IAD. Each airport in the United States is assigned a unique three-letter code by the International Civil Aviation Organization (ICAO) and the International Air Transport Association (IATA) for easy identification.

IAD is specifically designated for Dulles International Airport, which serves as a major hub for international flights entering and departing from the Washington, D.C. area. The code is derived from the name "Dulles," making it intuitive for those familiar with the airport and its location.

In contrast, DCA refers to Ronald Reagan Washington National Airport, which is located closer to downtown Washington, D.C., and serves primarily domestic flights. BKG and IAH are codes that correspond to airports in other locations; BKG does not correlate to a major airport tied to Washington, D.C., and IAH is the code for George Bush Intercontinental Airport in Houston, Texas.