There are
2,052 mi
from San Marcos, CA to Mt Juliet, TN
That's the driving distance. It would take 1 day 11 hours to go from San Marcos, California to Mt Juliet, Tennessee.
The flight distance (direct flight from San Marcos, CA to Mt Juliet, TN) is 1,746.97 mi.
2,052 mi = 3.22 kms