There are
1,865 mi
from Kennewick, WA to Dekalb, IL
That's the driving distance. It would take 1 day 8 hours to go from Kennewick, Washington to Dekalb, Illinois.
The flight distance (direct flight from Kennewick, WA to Dekalb, IL) is 1,527.39 mi.
1,865 mi = 3,001.79 kms