There are
845 mi
from Wilmington, DE to Wauwatosa, WI
That's the driving distance. It would take 15 hours 55 mins to go from Wilmington, Delaware to Wauwatosa, Wisconsin.
The flight distance (direct flight from Wilmington, DE to Wauwatosa, WI) is 684.19 mi.
845 mi = 1,359.49 kms