There are
710 mi
from Kennewick, WA to Ukiah, CA
That's the driving distance. It would take 14 hours 32 mins to go from Kennewick, Washington to Ukiah, California.
The flight distance (direct flight from Kennewick, WA to Ukiah, CA) is 529.69 mi.
710 mi = 1,142.44 kms