There are
279 mi
from Gaithersburg, MD to Peekskill, NY
That's the driving distance. It would take 5 hours 44 mins to go from Gaithersburg, Maryland to Peekskill, New York.
The flight distance (direct flight from Gaithersburg, MD to Peekskill, NY) is 227.93 mi.
279 mi = 449.49 kms