There are
324 mi
from Gaithersburg, MD to Canandaigua, NY
That's the driving distance. It would take 7 hours 4 mins to go from Gaithersburg, Maryland to Canandaigua, New York.
The flight distance (direct flight from Gaithersburg, MD to Canandaigua, NY) is 258.73 mi.
324 mi = 521.94 kms