As a suburb of a major city Washington DC with another major city less than an hour away Baltimore getting into Gaithersburg is relatively easy. Flights into Reagan National DCA, Dulles IAD, and Baltimore BWI are generally inexpensive from major avenues across the USA and world.
The MARC Maryland Train System has three stops in Gaithersburg and runs southbound towards DC in the morning and northbound away from DC in the evening to accommodate those who work in DC and inner suburbs. The Metro (http://www.wmata.com/rail/) Red Line ends at Shady Grove (http://www.wmata.com/rail...). Many county (http://www.montgomerycoun...) and metro (http://www.wmata.com/bus/) buses serve the stop and can take you to most areas of Gaithersburg.
From D.C. and the south or west take the Capital Beltway I-495 to Interstate 270 North. Exits 8, 9, 10, and 11 serve Gaithersburg.
