There are
1,532 mi
from Porterville, CA to San Marcos, TX
That's the driving distance. It would take 1 day 2 hours to go from Porterville, California to San Marcos, Texas.
The flight distance (direct flight from Porterville, CA to San Marcos, TX) is 1,290.92 mi.
1,532 mi = 2,465.85 kms