There are
257 mi
from Decatur, IL to Waunakee, WI
That's the driving distance. It would take 4 hours 56 mins to go from Decatur, Illinois to Waunakee, Wisconsin.
The flight distance (direct flight from Decatur, IL to Waunakee, WI) is 233.02 mi.
257 mi = 413.31 kms