There are
1,511 mi
from Harlingen, TX to Santee, CA
That's the driving distance. It would take 1 day 1 hour to go from Harlingen, Texas to Santee, California.
The flight distance (direct flight from Harlingen, TX to Santee, CA) is 1,244.38 mi.
1,511 mi = 2,430.92 kms