There are
1,606 mi
from Allentown, PA to Harker Heights, TX
That's the driving distance. It would take 1 day 4 hours to go from Allentown, Pennsylvania to Harker Heights, Texas.
The flight distance (direct flight from Allentown, PA to Harker Heights, TX) is 1,399.64 mi.
1,606 mi = 1.61 kms