There are
854 mi
from Oshkosh, WI to Fort Smith, AR
That's the driving distance. It would take 15 hours 41 mins to go from Oshkosh, Wisconsin to Fort Smith, Arkansas.
The flight distance (direct flight from Oshkosh, WI to Fort Smith, AR) is 672.73 mi.
854 mi = 1,375.02 kms