There are
1,747 mi
from Gilbert, AZ to Merrillville, IN
That's the driving distance. It would take 1 day 7 hours to go from Gilbert, Arizona to Merrillville, Indiana.
The flight distance (direct flight from Gilbert, AZ to Merrillville, IN) is 1,448.48 mi.
1,747 mi = 1.61 kms