There are
2,684 mi
from Irvine, CA to Allentown, PA
That's the driving distance. It would take 2 days to go from Irvine, California to Allentown, Pennsylvania.
The flight distance (direct flight from Irvine, CA to Allentown, PA) is 2,355.16 mi.
2,684 mi = 4,319.71 kms