There are
2,062 mi
from Costa Mesa, CA to Oshkosh, WI
That's the driving distance. It would take 1 day 12 hours to go from Costa Mesa, California to Oshkosh, Wisconsin.
The flight distance (direct flight from Costa Mesa, CA to Oshkosh, WI) is 1,724.12 mi.
2,062 mi = 3.22 kms