Miles between Thornton, CO and Lake Forest, IL

There are
1,014 mi
from Thornton, CO to Lake Forest, IL

That's the driving distance. It would take 18 hours 1 min to go from Thornton, Colorado to Lake Forest, Illinois.

The flight distance (direct flight from Thornton, CO to Lake Forest, IL) is 906 mi.

1,014 mi = 1.61 kms