There are
2,215 mi
from San Marcos, CA to Maryville, TN
That's the driving distance. It would take 1 day 14 hours to go from San Marcos, California to Maryville, Tennessee.
The flight distance (direct flight from San Marcos, CA to Maryville, TN) is 1,890.93 mi.
2,215 mi = 3.22 kms