There are
1,656 mi
from Harlingen, TX to Wausau, WI
That's the driving distance. It would take 1 day 5 hours to go from Harlingen, Texas to Wausau, Wisconsin.
The flight distance (direct flight from Harlingen, TX to Wausau, WI) is 1,371.97 mi.
1,656 mi = 2,665.84 kms