There are
1,125 mi
from Thornton, CO to Radcliff, KY
That's the driving distance. It would take 20 hours 5 mins to go from Thornton, Colorado to Radcliff, Kentucky.
The flight distance (direct flight from Thornton, CO to Radcliff, KY) is 1,031.09 mi.
1,125 mi = 1.61 kms