There are
2,044 mi
from Oshkosh, WI to San Marino, CA
That's the driving distance. It would take 1 day 12 hours to go from Oshkosh, Wisconsin to San Marino, California.
The flight distance (direct flight from Oshkosh, WI to San Marino, CA) is 1,715.16 mi.
2,044 mi = 3,288.93 kms