There are
959 mi
from Missoula, MT to Clearlake, CA
That's the driving distance. It would take 19 hours 8 mins to go from Missoula, Montana to Clearlake, California.
The flight distance (direct flight from Missoula, MT to Clearlake, CA) is 697.52 mi.
959 mi = 1,543.37 kms