There are
2,823 mi
from San Marcos, CA to Cliffside Park, NJ
That's the driving distance. It would take 2 days 2 hours to go from San Marcos, California to Cliffside Park, New Jersey.
The flight distance (direct flight from San Marcos, CA to Cliffside Park, NJ) is 2,416.11 mi.
2,823 mi = 3.22 kms