Flight
DCA airport is closest to DC (About 15-20 minutes). Metro accessible. Possibility of more traffic getting in and out of the airport if you Uber/rent car.
Flight
IAD is closer to NoVA suburbs and about 30-40 minutes from DC. Metro accessible. Less chance of traffic getting in and out of the airport.
Flight
Located closer to Baltimore. About an hour from DC. You would have to Uber or use Amtrak trains to get to DC area.
Hotel
Hotel