There are
837 mi
from Harlingen, TX to Fayetteville, AR
That's the driving distance. It would take 15 hours 27 mins to go from Harlingen, Texas to Fayetteville, Arkansas.
The flight distance (direct flight from Harlingen, TX to Fayetteville, AR) is 713.32 mi.
837 mi = 1,346.25 kms