There are
1,082 mi
from Kennewick, WA to Downey, CA
That's the driving distance. It would take 20 hours 20 mins to go from Kennewick, Washington to Downey, California.
The flight distance (direct flight from Kennewick, WA to Downey, CA) is 849.50 mi.
1,082 mi = 1,741.29 kms