There are
1,514 mi
from Thornton, CO to Clemson, SC
That's the driving distance. It would take 1 day 3 hours to go from Thornton, Colorado to Clemson, South Carolina.
The flight distance (direct flight from Thornton, CO to Clemson, SC) is 1,264.80 mi.
1,514 mi = 1.61 kms