There are
857 mi
from Fort Smith, AR to Oshkosh, WI
That's the driving distance. It would take 15 hours 50 mins to go from Fort Smith, Arkansas to Oshkosh, Wisconsin.
The flight distance (direct flight from Fort Smith, AR to Oshkosh, WI) is 672.73 mi.
857 mi = 1,379.06 kms