There are
2,792 mi
from San Marcos, CA to Sayreville, NJ
That's the driving distance. It would take 2 days 2 hours to go from San Marcos, California to Sayreville, New Jersey.
The flight distance (direct flight from San Marcos, CA to Sayreville, NJ) is 2,397.25 mi.
2,792 mi = 3.22 kms