There are
896 mi
from Allentown, PA to Festus, MO
That's the driving distance. It would take 17 hours 7 mins to go from Allentown, Pennsylvania to Festus, Missouri.
The flight distance (direct flight from Allentown, PA to Festus, MO) is 811.53 mi.
896 mi = 1,441.39 kms