There are
1,002 mi
from Greeley, CO to Waukegan, IL
That's the driving distance. It would take 18 hours 8 mins to go from Greeley, Colorado to Waukegan, Illinois.
The flight distance (direct flight from Greeley, CO to Waukegan, IL) is 882.83 mi.
1,002 mi = 1.61 kms