There are
336 mi
from Oshkosh, WI to Duluth, MN
That's the driving distance. It would take 6 hours 38 mins to go from Oshkosh, Wisconsin to Duluth, Minnesota.
The flight distance (direct flight from Oshkosh, WI to Duluth, MN) is 257.25 mi.
336 mi = 540.17 kms