There are
674 mi
from San Mateo, CA to Washougal, WA
That's the driving distance. It would take 13 hours 4 mins to go from San Mateo, California to Washougal, Washington.
The flight distance (direct flight from San Mateo, CA to Washougal, WA) is 554.10 mi.
674 mi = 1,084.84 kms