There are
264 mi
from Decatur, IL to Wauwatosa, WI
That's the driving distance. It would take 5 hours 3 mins to go from Decatur, Illinois to Wauwatosa, Wisconsin.
The flight distance (direct flight from Decatur, IL to Wauwatosa, WI) is 227.09 mi.
264 mi = 424.27 kms