There are
307 mi
from Champaign, IL to Oshkosh, WI
That's the driving distance. It would take 5 hours 56 mins to go from Champaign, Illinois to Oshkosh, Wisconsin.
The flight distance (direct flight from Champaign, IL to Oshkosh, WI) is 270.47 mi.
307 mi = 494.78 kms