There are
2,016 mi
from San Marcos, CA to Spring Hill, TN
That's the driving distance. It would take 1 day 11 hours to go from San Marcos, California to Spring Hill, Tennessee.
The flight distance (direct flight from San Marcos, CA to Spring Hill, TN) is 1,725.34 mi.
2,016 mi = 3,243.96 kms