There are
2,071 mi
from Oshkosh, WI to Simi Valley, CA
That's the driving distance. It would take 1 day 13 hours to go from Oshkosh, Wisconsin to Simi Valley, California.
The flight distance (direct flight from Oshkosh, WI to Simi Valley, CA) is 1,742.42 mi.
2,071 mi = 3,333.65 kms