There are
1,725 mi
from Rapid City, SD to Poughkeepsie, NY
That's the driving distance. It would take 1 day 6 hours to go from Rapid City, South Dakota to Poughkeepsie, New York.
The flight distance (direct flight from Rapid City, SD to Poughkeepsie, NY) is 1,484.88 mi.
1,725 mi = 2,776.24 kms