There are
533 mi
from Missoula, MT to Washougal, WA
That's the driving distance. It would take 9 hours 57 mins to go from Missoula, Montana to Washougal, Washington.
The flight distance (direct flight from Missoula, MT to Washougal, WA) is 407.80 mi.
533 mi = 858.00 kms