There are
1,600 mi
from Harlingen, TX to Pasadena, CA
That's the driving distance. It would take 1 day 3 hours to go from Harlingen, Texas to Pasadena, California.
The flight distance (direct flight from Harlingen, TX to Pasadena, CA) is 1,336.21 mi.
1,600 mi = 2,575.43 kms