There are
457 mi
from Oshkosh, WI to St Peters, MO
That's the driving distance. It would take 8 hours 37 mins to go from Oshkosh, Wisconsin to St Peters, Missouri.
The flight distance (direct flight from Oshkosh, WI to St Peters, MO) is 377.88 mi.
457 mi = 735.63 kms