There are
439 mi
from St Louis, MO to Oshkosh, WI
That's the driving distance. It would take 8 hours 18 mins to go from St Louis, Missouri to Oshkosh, Wisconsin.
The flight distance (direct flight from St Louis, MO to Oshkosh, WI) is 382.70 mi.
439 mi = 706.39 kms