There are
1,431 mi
from Harlingen, TX to Dayton, OH
That's the driving distance. It would take 1 day 2 hours to go from Harlingen, Texas to Dayton, Ohio.
The flight distance (direct flight from Harlingen, TX to Dayton, OH) is 1,218.29 mi.
1,431 mi = 2,303.17 kms