There are
2,018 mi
from Huntsville, AL to San Marcos, CA
That's the driving distance. It would take 1 day 11 hours to go from Huntsville, Alabama to San Marcos, California.
The flight distance (direct flight from Huntsville, AL to San Marcos, CA) is 1,749.65 mi.
2,018 mi = 3,246.96 kms