There are
1,448 mi
from Garland, TX to Allentown, PA
That's the driving distance. It would take 1 day 2 hours to go from Garland, Texas to Allentown, Pennsylvania.
The flight distance (direct flight from Garland, TX to Allentown, PA) is 1,281.42 mi.
1,448 mi = 2,330.34 kms