There are
1,493 mi
from Pasadena, TX to San Marcos, CA
That's the driving distance. It would take 1 day 1 hour to go from Pasadena, Texas to San Marcos, California.
The flight distance (direct flight from Pasadena, TX to San Marcos, CA) is 1,313.90 mi.
1,493 mi = 1.61 kms