There are
1,568 mi
from Thornton, CO to Greensboro, NC
That's the driving distance. It would take 1 day 4 hours to go from Thornton, Colorado to Greensboro, North Carolina.
The flight distance (direct flight from Thornton, CO to Greensboro, NC) is 1,391.51 mi.
1,568 mi = 1.61 kms