There are
507 mi
from St Joseph, MO to Oconomowoc, WI
That's the driving distance. It would take 9 hours 50 mins to go from St Joseph, Missouri to Oconomowoc, Wisconsin.
The flight distance (direct flight from St Joseph, MO to Oconomowoc, WI) is 401.63 mi.
507 mi = 816.68 kms