There are
1,944 mi
from Kennewick, WA to Merrillville, IN
That's the driving distance. It would take 1 day 10 hours to go from Kennewick, Washington to Merrillville, Indiana.
The flight distance (direct flight from Kennewick, WA to Merrillville, IN) is 1,606.75 mi.
1,944 mi = 3,128.70 kms