There are
1,288 mi
from Thornton, CO to Chattanooga, TN
That's the driving distance. It would take 23 hours 2 mins to go from Thornton, Colorado to Chattanooga, Tennessee.
The flight distance (direct flight from Thornton, CO to Chattanooga, TN) is 1,126 mi.
1,288 mi = 1.61 kms