There are
899 mi
from Rockford, IL to Poughkeepsie, NY
That's the driving distance. It would take 16 hours 59 mins to go from Rockford, Illinois to Poughkeepsie, New York.
The flight distance (direct flight from Rockford, IL to Poughkeepsie, NY) is 779.22 mi.
899 mi = 1,447.33 kms