There are
1,059 mi
from Greeley, CO to Monrovia, CA
That's the driving distance. It would take 18 hours 32 mins to go from Greeley, Colorado to Monrovia, California.
The flight distance (direct flight from Greeley, CO to Monrovia, CA) is 848.46 mi.
1,059 mi = 1.61 kms