There are
2,115 mi
from Oshkosh, WI to La Mesa, CA
That's the driving distance. It would take 1 day 13 hours to go from Oshkosh, Wisconsin to La Mesa, California.
The flight distance (direct flight from Oshkosh, WI to La Mesa, CA) is 1,715.28 mi.
2,115 mi = 3,403.72 kms