There are
1,785 mi
from Longmont, CO to Yonkers, NY
That's the driving distance. It would take 1 day 8 hours to go from Longmont, Colorado to Yonkers, New York.
The flight distance (direct flight from Longmont, CO to Yonkers, NY) is 1,630.31 mi.
1,785 mi = 1.61 kms