There are
2,448 mi
from Yakima, WA to Slidell, LA
That's the driving distance. It would take 1 day 19 hours to go from Yakima, Washington to Slidell, Louisiana.
The flight distance (direct flight from Yakima, WA to Slidell, LA) is 1,989.25 mi.
2,448 mi = 3.22 kms