There are
1,034 mi
from Thornton, CO to Wauwatosa, WI
That's the driving distance. It would take 18 hours 18 mins to go from Thornton, Colorado to Wauwatosa, Wisconsin.
The flight distance (direct flight from Thornton, CO to Wauwatosa, WI) is 903.78 mi.
1,034 mi = 1.61 kms