There are
2,767 mi
from Downey, CA to Florham Park, NJ
That's the driving distance. It would take 2 days 1 hour to go from Downey, California to Florham Park, New Jersey.
The flight distance (direct flight from Downey, CA to Florham Park, NJ) is 2,422.68 mi.
2,767 mi = 3.22 kms