There are
2,152 mi
from Oshkosh, WI to Walnut Creek, CA
That's the driving distance. It would take 1 day 13 hours to go from Oshkosh, Wisconsin to Walnut Creek, California.
The flight distance (direct flight from Oshkosh, WI to Walnut Creek, CA) is 1,786.06 mi.
2,152 mi = 3,463.72 kms