It is DCA
The flight distance from Logan International Airport to Ronald Reagan Washington National Airport is 399 miles. The driving distance is about 450 miles.
The code is DCA.
DCA is Reagan International IAD is Dulles International
About 115 miles using I-95 S.
Ronald Reagan Washington National Airport (DCA) Washington Dulles International Airport (IAD) Thurgood Marshall Baltimore/Washington International Airport (BWI)
The nearest major airport is Ronald Reagan Washington National Airport (DCA / KDCA). This airport has international and domestic flights from Washington, District of Columbia and is about 13 road miles from the center of Springfield, VA.
The nearest major airport is Ronald Reagan Washington National Airport (DCA / KDCA). This airport has international and domestic flights from Washington, District of Columbia and is about 12 driving miles distance from the center of Cheverly.
While none of them are actually located inside the city, the Washington DC major airports are Ronald Reagan National Airport (DCA), Dulles International Airport (IAD) and Baltimore-Washington International Airport (BWI). Reagan is the closest to Washington, with a Metro station on-site.
The driving distance from Ronald Reagan Washington National Airport to Washington Dulles International Airport is:30 miles / 48 km
The nearest airports to Washington, DC are Reagan International Airport (DCA) which is right near town and Dulles Airport (IAD) which is west of town but is the major international airport for the area.
IF you mean the US, the capital city airport is Dulles for International Flights and Reagan National for domestic travel.
Who cares, just bring me a bucket of fried chicken.