There are
1,698 mi
from Great Falls, MT to Madisonville, KY
That's the driving distance. It would take 1 day 6 hours to go from Great Falls, Montana to Madisonville, Kentucky.
The flight distance (direct flight from Great Falls, MT to Madisonville, KY) is 1,394.58 mi.
1,698 mi = 2,732.10 kms