There are
1,556 mi
from Rialto, CA to Harlingen, TX
That's the driving distance. It would take 1 day 2 hours to go from Rialto, California to Harlingen, Texas.
The flight distance (direct flight from Rialto, CA to Harlingen, TX) is 1,293.42 mi.
1,556 mi = 1.61 kms