There are
1,949 mi
from Pleasanton, CA to Harlingen, TX
That's the driving distance. It would take 1 day 9 hours to go from Pleasanton, California to Harlingen, Texas.
The flight distance (direct flight from Pleasanton, CA to Harlingen, TX) is 1,617.28 mi.
1,949 mi = 3,137.09 kms