There are 45.89 miles from San Marcos to San Antonio in southwest direction and 49 miles (78.86 kilometers) by car, following the I-35 S route.
San Marcos and San Antonio are 47 minutes far apart, if you drive non-stop .
This is the fastest route from San Marcos, TX to San Antonio, TX. The halfway point is Cibolo, TX.
San Marcos, TX and San Antonio, TX are in the same time zone (CDT). Current time in both locations is 10:19 am.
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