There are
2,667 mi
from Allentown, PA to Walnut, CA
That's the driving distance. It would take 1 day 23 hours to go from Allentown, Pennsylvania to Walnut, California.
The flight distance (direct flight from Allentown, PA to Walnut, CA) is 2,349.37 mi.
2,667 mi = 4,292.06 kms