There are
1,679 mi
from Thornton, CO to Endicott, NY
That's the driving distance. It would take 1 day 6 hours to go from Thornton, Colorado to Endicott, New York.
The flight distance (direct flight from Thornton, CO to Endicott, NY) is 1,509.16 mi.
1,679 mi = 1.61 kms