There are
1,140 mi
from Thornton, CO to Shelbyville, KY
That's the driving distance. It would take 20 hours 25 mins to go from Thornton, Colorado to Shelbyville, Kentucky.
The flight distance (direct flight from Thornton, CO to Shelbyville, KY) is 1,063.77 mi.
1,140 mi = 1.61 kms