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Don't know about Metro accessibility from Bethesda, but if you can get to Metro, DCA might be alright.
IAD should be fine once you get around the beltway, but it's always a crapshoot. Could easily take an hour to get to the Dulles Access Road, at which point it'd take another 20ish (depending on how fast the cab drives) to get to the airport.
/tk
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