Originally Posted by TMAYER
Also -the quickest way is to take the Yellow line and change at Archives/Navy Memorial, but if you don't want to deal with changing and have time, you can also just ride the Blue line all the way from DCA to RFK although it will probably add 15 minutes or so to the trip.
Still only 30 minutes taking the blue line straight through. You don't really save much time once you consider time spent changing/waiting for trains.