There are
1,593 mi
from Missoula, MT to St Charles, MO
That's the driving distance. It would take 1 day 3 hours to go from Missoula, Montana to St Charles, Missouri.
The flight distance (direct flight from Missoula, MT to St Charles, MO) is 1,308.65 mi.
1,593 mi = 1.61 kms