There are
497 mi
from Rancho Cucamonga, CA to Clearlake, CA
That's the driving distance. It would take 9 hours 37 mins to go from Rancho Cucamonga, California to Clearlake, California.
The flight distance (direct flight from Rancho Cucamonga, CA to Clearlake, CA) is 436.25 mi.
497 mi = 800.05 kms