Ronald Reagan Washington National Airport Airport codesDCAKDCADCA is a public airport located three miles (5 km (Kilometre)) south of the central business district of Washington, D.C., in Arlington County, Virginia, United States. It is the nearest commercial airport to Washington, D.C. Originally named Washington National Airport, the facility was renamed to honor former President (President of the United States) Ronald Reagan in 1998. The airport is commonly known as "National", "Washington National", "Reagan", and "Reagan National". "DCA" is used as the main airport code.

The airport is a focus city for US Airways, the airports largest carrier. The US Airways Shuttle offers near-hourly air shuttle service to LaGuardia Airport in New York City and Logan International Airport in Boston, Massachusetts. Delta Air Lines Delta Shuttle also offers near-hourly air shuttle service to LaGuardia. With a handful of exceptions, flights are restricted to destinations within 1,250 miles (2,012 km), in an effort to control aviation noise and to drive air traffic to the larger but more distant Washington Dulles International Airport. In 2006, the airport served approximately 18.5 million passengers. Because the airport only provides U.S. immigration and customs facilities for corporate jet traffic, the only international flights allowed to land at DCA are those from airports with U.S. Customs and Border Protection preclearance (United States border preclearance), which include Nassau, Bahamas (Lynden Pindling International Airport); Bermuda (L.F. Wade International Airport) (seasonal); and most major airports in eastern Canada.