There are
1,508 mi
from Conroe, TX to San Marcos, CA
That's the driving distance. It would take 1 day 1 hour to go from Conroe, Texas to San Marcos, California.
The flight distance (direct flight from Conroe, TX to San Marcos, CA) is 1,288.37 mi.
1,508 mi = 2,426.48 kms