There are
2,686 mi
from Downey, CA to Allentown, PA
That's the driving distance. It would take 2 days to go from Downey, California to Allentown, Pennsylvania.
The flight distance (direct flight from Downey, CA to Allentown, PA) is 2,365.65 mi.
2,686 mi = 4,323.31 kms