There are
2,079 mi
from San Marcos, CA to Opelika, AL
That's the driving distance. It would take 1 day 12 hours to go from San Marcos, California to Opelika, Alabama.
The flight distance (direct flight from San Marcos, CA to Opelika, AL) is 1,837.38 mi.
2,079 mi = 3.22 kms