There are
2,107 mi
from San Marcos, CA to Seymour, IN
That's the driving distance. It would take 1 day 13 hours to go from San Marcos, California to Seymour, Indiana.
The flight distance (direct flight from San Marcos, CA to Seymour, IN) is 1,783.35 mi.
2,107 mi = 3.22 kms