There are
44 mi
from Rancho Cucamonga, CA to Fountain Valley, CA
That's the driving distance. It would take 1 hour to go from Rancho Cucamonga, California to Fountain Valley, California.
The flight distance (direct flight from Rancho Cucamonga, CA to Fountain Valley, CA) is 34.38 mi.
44 mi = 71.41 kms