There are
860 mi
from Wilmington, DE to Fort Atkinson, WI
That's the driving distance. It would take 16 hours 27 mins to go from Wilmington, Delaware to Fort Atkinson, Wisconsin.
The flight distance (direct flight from Wilmington, DE to Fort Atkinson, WI) is 722.78 mi.
860 mi = 1,383.81 kms