There are
1,795 mi
from Thornton, CO to Poughkeepsie, NY
That's the driving distance. It would take 1 day 8 hours to go from Thornton, Colorado to Poughkeepsie, New York.
The flight distance (direct flight from Thornton, CO to Poughkeepsie, NY) is 1,620.57 mi.
1,795 mi = 1.61 kms