There are
1,083 mi
from Thornton, CO to Wausau, WI
That's the driving distance. It would take 19 hours 13 mins to go from Thornton, Colorado to Wausau, Wisconsin.
The flight distance (direct flight from Thornton, CO to Wausau, WI) is 856.23 mi.
1,083 mi = 1.61 kms