There are
1,908 mi
from Kennewick, WA to Plainfield, IL
That's the driving distance. It would take 1 day 9 hours to go from Kennewick, Washington to Plainfield, Illinois.
The flight distance (direct flight from Kennewick, WA to Plainfield, IL) is 1,561.59 mi.
1,908 mi = 3,070.09 kms