There are
2,436 mi
from Downey, CA to Monroeville, PA
That's the driving distance. It would take 1 day 19 hours to go from Downey, California to Monroeville, Pennsylvania.
The flight distance (direct flight from Downey, CA to Monroeville, PA) is 2,140.34 mi.
2,436 mi = 3,920.58 kms