There are
1,685 mi
from Great Falls, MT to Jeffersontown, KY
That's the driving distance. It would take 1 day 6 hours to go from Great Falls, Montana to Jeffersontown, Kentucky.
The flight distance (direct flight from Great Falls, MT to Jeffersontown, KY) is 1,444.46 mi.
1,685 mi = 2,711.74 kms