There are
1,198 mi
from Missoula, MT to Arcadia, CA
That's the driving distance. It would take 20 hours 6 mins to go from Missoula, Montana to Arcadia, California.
The flight distance (direct flight from Missoula, MT to Arcadia, CA) is 903.55 mi.
1,198 mi = 1.61 kms