There are
2,565 mi
from Kennewick, WA to Simpsonville, SC
That's the driving distance. It would take 1 day 21 hours to go from Kennewick, Washington to Simpsonville, South Carolina.
The flight distance (direct flight from Kennewick, WA to Simpsonville, SC) is 2,071.38 mi.
2,565 mi = 4,128.60 kms