There are
778 mi
from Garland, TX to Chattanooga, TN
That's the driving distance. It would take 13 hours 53 mins to go from Garland, Texas to Chattanooga, Tennessee.
The flight distance (direct flight from Garland, TX to Chattanooga, TN) is 665.22 mi.
778 mi = 1,252.68 kms