There are
1,436 mi
from Harlingen, TX to Mchenry, IL
That's the driving distance. It would take 1 day 3 hours to go from Harlingen, Texas to Mchenry, Illinois.
The flight distance (direct flight from Harlingen, TX to Mchenry, IL) is 1,236.58 mi.
1,436 mi = 2,310.37 kms