There are
1,296 mi
from San Marcos, CA to Schertz, TX
That's the driving distance. It would take 22 hours 4 mins to go from San Marcos, California to Schertz, Texas.
The flight distance (direct flight from San Marcos, CA to Schertz, TX) is 1,140.57 mi.
1,296 mi = 1.61 kms