There are
1,642 mi
from Beaverton, OR to Watertown, SD
That's the driving distance. It would take 1 day 3 hours to go from Beaverton, Oregon to Watertown, South Dakota.
The flight distance (direct flight from Beaverton, OR to Watertown, SD) is 1,246.15 mi.
1,642 mi = 1.61 kms