There are
1,494 mi
from San Marcos, CA to Pasadena, TX
That's the driving distance. It would take 1 day 1 hour to go from San Marcos, California to Pasadena, Texas.
The flight distance (direct flight from San Marcos, CA to Pasadena, TX) is 1,313.90 mi.
1,494 mi = 1.61 kms