There are
2,186 mi
from Oshkosh, WI to San Mateo, CA
That's the driving distance. It would take 1 day 14 hours to go from Oshkosh, Wisconsin to San Mateo, California.
The flight distance (direct flight from Oshkosh, WI to San Mateo, CA) is 1,808.93 mi.
2,186 mi = 3,517.44 kms