Ronald Reagan Washington National airport can be considered better than Baltimore/Washington and Dulles airports because it is closer to the city centre and linked to parts of Washington DC by fast Metro trains which takes just 15 minutes total transfer journey time. It will cost you around $2-$4 for the trip to the city centre, as an airport serving the capital of the United States of America and Baltimore region, you might experience some queues at security and immigration due to influx of tourists.