There are
1,063 mi
from Kennewick, WA to Monrovia, CA
That's the driving distance. It would take 20 hours 13 mins to go from Kennewick, Washington to Monrovia, California.
The flight distance (direct flight from Kennewick, WA to Monrovia, CA) is 835.87 mi.
1,063 mi = 1,711.39 kms