There are
1,836 mi
from Harlingen, TX to Mendota, CA
That's the driving distance. It would take 1 day 8 hours to go from Harlingen, Texas to Mendota, California.
The flight distance (direct flight from Harlingen, TX to Mendota, CA) is 1,517.44 mi.
1,836 mi = 2,954.62 kms