There are
2,182 mi
from Great Falls, MT to Peekskill, NY
That's the driving distance. It would take 1 day 15 hours to go from Great Falls, Montana to Peekskill, New York.
The flight distance (direct flight from Great Falls, MT to Peekskill, NY) is 1,875.35 mi.
2,182 mi = 3,512.18 kms