San Marcos is located on Highway 78 between Oceanside and Escondido. It is roughly 35 miles north of San Diego via I-5 or I-15 to Highway 78. The nearest major airport is San Diego. The nearest minor airport is Palomar Airport in Carlsbad.
The SPRINTER (http://www.gonctd.com/spr...), a new light rail which runs between Oceanside and Escondido, stops in San Marcos.
