There are
387 mi
from Gaithersburg, MD to Oswego, NY
That's the driving distance. It would take 7 hours 56 mins to go from Gaithersburg, Maryland to Oswego, New York.
The flight distance (direct flight from Gaithersburg, MD to Oswego, NY) is 300.07 mi.
387 mi = 622.01 kms