There are
1,651 mi
from Thornton, CO to Knightdale, NC
That's the driving distance. It would take 1 day 6 hours to go from Thornton, Colorado to Knightdale, North Carolina.
The flight distance (direct flight from Thornton, CO to Knightdale, NC) is 1,467.31 mi.
1,651 mi = 1.61 kms