There are
1,537 mi
from Sioux Falls, SD to Washougal, WA
That's the driving distance. It would take 1 day 2 hours to go from Sioux Falls, South Dakota to Washougal, Washington.
The flight distance (direct flight from Sioux Falls, SD to Washougal, WA) is 1,265.07 mi.
1,537 mi = 1.61 kms