There are
2,442 mi
from Downey, CA to Plum, PA
That's the driving distance. It would take 1 day 19 hours to go from Downey, California to Plum, Pennsylvania.
The flight distance (direct flight from Downey, CA to Plum, PA) is 2,142.34 mi.
2,442 mi = 3,929.48 kms