There are
1,566 mi
from Great Falls, MT to Beech Grove, IN
That's the driving distance. It would take 1 day 4 hours to go from Great Falls, Montana to Beech Grove, Indiana.
The flight distance (direct flight from Great Falls, MT to Beech Grove, IN) is 1,363.12 mi.
1,566 mi = 2,520.02 kms