There are
1,785 mi
from Rancho Cucamonga, CA to Clayton, MO
That's the driving distance. It would take 1 day 7 hours to go from Rancho Cucamonga, California to Clayton, Missouri.
The flight distance (direct flight from Rancho Cucamonga, CA to Clayton, MO) is 1,543.03 mi.
1,785 mi = 1.61 kms