There are
744 mi
from Allentown, PA to Glendale Heights, IL
That's the driving distance. It would take 14 hours 1 min to go from Allentown, Pennsylvania to Glendale Heights, Illinois.
The flight distance (direct flight from Allentown, PA to Glendale Heights, IL) is 659.44 mi.
744 mi = 1,197.38 kms