There are
1,950 mi
from Harlingen, TX to Oakley, CA
That's the driving distance. It would take 1 day 10 hours to go from Harlingen, Texas to Oakley, California.
The flight distance (direct flight from Harlingen, TX to Oakley, CA) is 1,618.04 mi.
1,950 mi = 3,137.52 kms