There are
1,735 mi
from Harlingen, TX to Johnstown, PA
That's the driving distance. It would take 1 day 8 hours to go from Harlingen, Texas to Johnstown, Pennsylvania.
The flight distance (direct flight from Harlingen, TX to Johnstown, PA) is 1,453.82 mi.
1,735 mi = 2,792.70 kms