There are
2,831 mi
from San Marcos, CA to Schenectady, NY
That's the driving distance. It would take 2 days 2 hours to go from San Marcos, California to Schenectady, New York.
The flight distance (direct flight from San Marcos, CA to Schenectady, NY) is 2,418.46 mi.
2,831 mi = 4,556.27 kms