There are
986 mi
from Oshkosh, WI to Hempstead, NY
That's the driving distance. It would take 18 hours 36 mins to go from Oshkosh, Wisconsin to Hempstead, New York.
The flight distance (direct flight from Oshkosh, WI to Hempstead, NY) is 794.33 mi.
986 mi = 1,586.12 kms