There are
1,614 mi
from San Marcos, CA to Sulphur, LA
That's the driving distance. It would take 1 day 3 hours to go from San Marcos, California to Sulphur, Louisiana.
The flight distance (direct flight from San Marcos, CA to Sulphur, LA) is 1,409.82 mi.
1,614 mi = 1.61 kms