There are
2,146 mi
from San Marcos, CA to Crossville, TN
That's the driving distance. It would take 1 day 13 hours to go from San Marcos, California to Crossville, Tennessee.
The flight distance (direct flight from San Marcos, CA to Crossville, TN) is 1,831.01 mi.
2,146 mi = 3.22 kms