Miles between Ontario, CA and Watertown, SD

There are
1,691 mi
from Ontario, CA to Watertown, SD

That's the driving distance. It would take 1 day 5 hours to go from Ontario, California to Watertown, South Dakota.

The flight distance (direct flight from Ontario, CA to Watertown, SD) is 1,320.53 mi.

1,691 mi = 1.61 kms