There are
1,708 mi
from Great Falls, MT to Radcliff, KY
That's the driving distance. It would take 1 day 6 hours to go from Great Falls, Montana to Radcliff, Kentucky.
The flight distance (direct flight from Great Falls, MT to Radcliff, KY) is 1,441.44 mi.
1,708 mi = 2,748.35 kms