There are
8 mi
from Rancho Cucamonga, CA to Montclair, CA
That's the driving distance. It would take 13 minutes to go from Rancho Cucamonga, California to Montclair, California.
The flight distance (direct flight from Rancho Cucamonga, CA to Montclair, CA) is 5.90 mi.
8 mi = 12.83 kms