Miles between Thornton, CO and Grayslake, IL

There are
1,001 mi
from Thornton, CO to Grayslake, IL

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

The flight distance (direct flight from Thornton, CO to Grayslake, IL) is 896.28 mi.

1,001 mi = 1.61 kms