There are
1,718 mi
from Pleasanton, CA to San Marcos, TX
That's the driving distance. It would take 1 day 5 hours to go from Pleasanton, California to San Marcos, Texas.
The flight distance (direct flight from Pleasanton, CA to San Marcos, TX) is 1,470.72 mi.
1,718 mi = 2,765.14 kms