Miles between Thornton, CO and Watertown, SD

There are
720 mi
from Thornton, CO to Watertown, SD

That's the driving distance. It would take 13 hours 5 mins to go from Thornton, Colorado to Watertown, South Dakota.

The flight distance (direct flight from Thornton, CO to Watertown, SD) is 530.25 mi.

720 mi = 1,158.69 kms