There are
1,618 mi
from Harlingen, TX to Parma, OH
That's the driving distance. It would take 1 day 6 hours to go from Harlingen, Texas to Parma, Ohio.
The flight distance (direct flight from Harlingen, TX to Parma, OH) is 1,390.26 mi.
1,618 mi = 2,604.62 kms