There are
1,933 mi
from Yakima, WA to Lake St Louis, MO
That's the driving distance. It would take 1 day 9 hours to go from Yakima, Washington to Lake St Louis, Missouri.
The flight distance (direct flight from Yakima, WA to Lake St Louis, MO) is 1,591.67 mi.
1,933 mi = 1.61 kms