There are
2,177 mi
from San Marcos, CA to Campbellsville, KY
That's the driving distance. It would take 1 day 13 hours to go from San Marcos, California to Campbellsville, Kentucky.
The flight distance (direct flight from San Marcos, CA to Campbellsville, KY) is 1,810.36 mi.
2,177 mi = 3.22 kms