There are
539 mi
from Oshkosh, WI to Chillicothe, OH
That's the driving distance. It would take 10 hours 30 mins to go from Oshkosh, Wisconsin to Chillicothe, Ohio.
The flight distance (direct flight from Oshkosh, WI to Chillicothe, OH) is 432.69 mi.
539 mi = 868.19 kms