There are
1,957 mi
from Rancho Cucamonga, CA to Westmont, IL
That's the driving distance. It would take 1 day 10 hours to go from Rancho Cucamonga, California to Westmont, Illinois.
The flight distance (direct flight from Rancho Cucamonga, CA to Westmont, IL) is 1,689.02 mi.
1,957 mi = 1.61 kms