There are
1,663 mi
from Arvada, CO to Gaithersburg, MD
That's the driving distance. It would take 1 day 5 hours to go from Arvada, Colorado to Gaithersburg, Maryland.
The flight distance (direct flight from Arvada, CO to Gaithersburg, MD) is 1,481.94 mi.
1,663 mi = 1.61 kms