There are
1,792 mi
from Great Falls, MT to Goodlettsville, TN
That's the driving distance. It would take 1 day 8 hours to go from Great Falls, Montana to Goodlettsville, Tennessee.
The flight distance (direct flight from Great Falls, MT to Goodlettsville, TN) is 1,471.84 mi.
1,792 mi = 2,883.23 kms