There are
1,929 mi
from Harlingen, TX to Lathrop, CA
That's the driving distance. It would take 1 day 9 hours to go from Harlingen, Texas to Lathrop, California.
The flight distance (direct flight from Harlingen, TX to Lathrop, CA) is 1,591.49 mi.
1,929 mi = 3,104.42 kms