There are
1,571 mi
from Thornton, CO to Reidsville, NC
That's the driving distance. It would take 1 day 5 hours to go from Thornton, Colorado to Reidsville, North Carolina.
The flight distance (direct flight from Thornton, CO to Reidsville, NC) is 1,392.20 mi.
1,571 mi = 1.61 kms