There are
1,744 mi
from Mesa, AZ to Merrillville, IN
That's the driving distance. It would take 1 day 7 hours to go from Mesa, Arizona to Merrillville, Indiana.
The flight distance (direct flight from Mesa, AZ to Merrillville, IN) is 1,448.44 mi.
1,744 mi = 1.61 kms