There are
337 mi
from Duluth, MN to Oshkosh, WI
That's the driving distance. It would take 6 hours 39 mins to go from Duluth, Minnesota to Oshkosh, Wisconsin.
The flight distance (direct flight from Duluth, MN to Oshkosh, WI) is 257.25 mi.
337 mi = 541.78 kms