There are
951 mi
from Garland, TX to Merrillville, IN
That's the driving distance. It would take 17 hours 1 min to go from Garland, Texas to Merrillville, Indiana.
The flight distance (direct flight from Garland, TX to Merrillville, IN) is 781.93 mi.
951 mi = 1,529.89 kms