There are
2,050 mi
from San Clemente, CA to Gallatin, TN
That's the driving distance. It would take 1 day 11 hours to go from San Clemente, California to Gallatin, Tennessee.
The flight distance (direct flight from San Clemente, CA to Gallatin, TN) is 1,769.99 mi.
2,050 mi = 3,298.62 kms