There are
1,035 mi
from Greeley, CO to Rancho Cucamonga, CA
That's the driving distance. It would take 18 hours 4 mins to go from Greeley, Colorado to Rancho Cucamonga, California.
The flight distance (direct flight from Greeley, CO to Rancho Cucamonga, CA) is 830.81 mi.
1,035 mi = 1,665.47 kms