There are
1,715 mi
from Great Falls, MT to Parma Heights, OH
That's the driving distance. It would take 1 day 6 hours to go from Great Falls, Montana to Parma Heights, Ohio.
The flight distance (direct flight from Great Falls, MT to Parma Heights, OH) is 1,506.84 mi.
1,715 mi = 2,759.84 kms