Miles between Thornton, CO and Cahokia, IL

There are
856 mi
from Thornton, CO to Cahokia, IL

That's the driving distance. It would take 15 hours 9 mins to go from Thornton, Colorado to Cahokia, Illinois.

The flight distance (direct flight from Thornton, CO to Cahokia, IL) is 795.39 mi.

856 mi = 1,377.71 kms