There are
1,868 mi
from Harlingen, TX to Allentown, PA
That's the driving distance. It would take 1 day 10 hours to go from Harlingen, Texas to Allentown, Pennsylvania.
The flight distance (direct flight from Harlingen, TX to Allentown, PA) is 1,614.54 mi.
1,868 mi = 3,006.26 kms