There are
1,800 mi
from Longmont, CO to Poughkeepsie, NY
That's the driving distance. It would take 1 day 8 hours to go from Longmont, Colorado to Poughkeepsie, New York.
The flight distance (direct flight from Longmont, CO to Poughkeepsie, NY) is 1,622.13 mi.
1,800 mi = 1.61 kms