There are
2,687 mi
from Allentown, PA to Downey, CA
That's the driving distance. It would take 2 days to go from Allentown, Pennsylvania to Downey, California.
The flight distance (direct flight from Allentown, PA to Downey, CA) is 2,365.65 mi.
2,687 mi = 4,323.67 kms