There are
912 mi
from Garland, TX to Glendale Heights, IL
That's the driving distance. It would take 17 hours 3 mins to go from Garland, Texas to Glendale Heights, Illinois.
The flight distance (direct flight from Garland, TX to Glendale Heights, IL) is 778.84 mi.
912 mi = 1,467.40 kms