There are
2,898 mi
from Union, NJ to San Leandro, CA
That's the driving distance. It would take 2 days 2 hours to go from Union, New Jersey to San Leandro, California.
The flight distance (direct flight from Union, NJ to San Leandro, CA) is 2,540.37 mi.
2,898 mi = 4,663.72 kms