There are
245 mi
from Yonkers, NY to Gaithersburg, MD
That's the driving distance. It would take 5 hours 3 mins to go from Yonkers, New York to Gaithersburg, Maryland.
The flight distance (direct flight from Yonkers, NY to Gaithersburg, MD) is 213.94 mi.
245 mi = 394.45 kms