There are
1,949 mi
from Kennewick, WA to Seguin, TX
That's the driving distance. It would take 1 day 11 hours to go from Kennewick, Washington to Seguin, Texas.
The flight distance (direct flight from Kennewick, WA to Seguin, TX) is 1,619.49 mi.
1,949 mi = 3,136.06 kms