There are
1,767 mi
from Thornton, CO to Hackensack, NJ
That's the driving distance. It would take 1 day 7 hours to go from Thornton, Colorado to Hackensack, New Jersey.
The flight distance (direct flight from Thornton, CO to Hackensack, NJ) is 1,620.96 mi.
1,767 mi = 1.61 kms