There are
1,944 mi
from Harlingen, TX to Brentwood, CA
That's the driving distance. It would take 1 day 10 hours to go from Harlingen, Texas to Brentwood, California.
The flight distance (direct flight from Harlingen, TX to Brentwood, CA) is 1,615.46 mi.
1,944 mi = 3,129.10 kms