There are
2,018 mi
from Ontario, CA to Oshkosh, WI
That's the driving distance. It would take 1 day 11 hours to go from Ontario, California to Oshkosh, Wisconsin.
The flight distance (direct flight from Ontario, CA to Oshkosh, WI) is 1,695.35 mi.
2,018 mi = 3.22 kms