There are
1,192 mi
from Missoula, MT to Walnut, CA
That's the driving distance. It would take 20 hours 1 min to go from Missoula, Montana to Walnut, California.
The flight distance (direct flight from Missoula, MT to Walnut, CA) is 909.62 mi.
1,192 mi = 1.61 kms