There are
2,761 mi
from Union, NJ to Monrovia, CA
That's the driving distance. It would take 2 days 1 hour to go from Union, New Jersey to Monrovia, California.
The flight distance (direct flight from Union, NJ to Monrovia, CA) is 2,416.96 mi.
2,761 mi = 4,443.55 kms