There are
734 mi
from Redwood City, CA to Yakima, WA
That's the driving distance. It would take 14 hours 40 mins to go from Redwood City, California to Yakima, Washington.
The flight distance (direct flight from Redwood City, CA to Yakima, WA) is 636.10 mi.
734 mi = 1,181.24 kms