There are
2,084 mi
from Missoula, MT to Zachary, LA
That's the driving distance. It would take 1 day 12 hours to go from Missoula, Montana to Zachary, Louisiana.
The flight distance (direct flight from Missoula, MT to Zachary, LA) is 1,653.64 mi.
2,084 mi = 3.22 kms