There are
2,762 mi
from San Marcos, CA to North Plainfield, NJ
That's the driving distance. It would take 2 days 1 hour to go from San Marcos, California to North Plainfield, New Jersey.
The flight distance (direct flight from San Marcos, CA to North Plainfield, NJ) is 2,393.43 mi.
2,762 mi = 4,444.87 kms