There are
727 mi
from San Mateo, CA to Yakima, WA
That's the driving distance. It would take 14 hours 30 mins to go from San Mateo, California to Yakima, Washington.
The flight distance (direct flight from San Mateo, CA to Yakima, WA) is 631.43 mi.
727 mi = 1,169.80 kms