There are
2,158 mi
from San Marcos, CA to Chattanooga, TN
That's the driving distance. It would take 1 day 13 hours to go from San Marcos, California to Chattanooga, Tennessee.
The flight distance (direct flight from San Marcos, CA to Chattanooga, TN) is 1,819.75 mi.
2,158 mi = 3.22 kms