There are
2,910 mi
from San Mateo, CA to Middlesex, NJ
That's the driving distance. It would take 2 days 3 hours to go from San Mateo, California to Middlesex, New Jersey.
The flight distance (direct flight from San Mateo, CA to Middlesex, NJ) is 2,542.83 mi.
2,910 mi = 4,683.92 kms