There are
2,036 mi
from Missoula, MT to Marietta, OH
That's the driving distance. It would take 1 day 12 hours to go from Missoula, Montana to Marietta, Ohio.
The flight distance (direct flight from Missoula, MT to Marietta, OH) is 1,706.53 mi.
2,036 mi = 3.22 kms