Miles between Thornton, CO and Round Lake, IL

There are
999 mi
from Thornton, CO to Round Lake, IL

That's the driving distance. It would take 17 hours 57 mins to go from Thornton, Colorado to Round Lake, Illinois.

The flight distance (direct flight from Thornton, CO to Round Lake, IL) is 893.71 mi.

999 mi = 1,607.09 kms