There are
947 mi
from Garland, TX to Merrillville, IN
That's the driving distance. It would take 17 hours 2 mins to go from Garland, Texas to Merrillville, Indiana.
The flight distance (direct flight from Garland, TX to Merrillville, IN) is 781.93 mi.
947 mi = 1,524.45 kms