There are
1,784 mi
from Rancho Cucamonga, CA to St Peters, MO
That's the driving distance. It would take 1 day 7 hours to go from Rancho Cucamonga, California to St Peters, Missouri.
The flight distance (direct flight from Rancho Cucamonga, CA to St Peters, MO) is 1,528.46 mi.
1,784 mi = 1.61 kms