There are
380 mi
from Rancho Cucamonga, CA to Brentwood, CA
That's the driving distance. It would take 7 hours 9 mins to go from Rancho Cucamonga, California to Brentwood, California.
The flight distance (direct flight from Rancho Cucamonga, CA to Brentwood, CA) is 349.83 mi.
380 mi = 611.03 kms