There are
1,832 mi
from Missoula, MT to Piqua, OH
That's the driving distance. It would take 1 day 8 hours to go from Missoula, Montana to Piqua, Ohio.
The flight distance (direct flight from Missoula, MT to Piqua, OH) is 1,552.09 mi.
1,832 mi = 1.61 kms