Miles between Longmont, CO and Watertown, SD

There are
713 mi
from Longmont, CO to Watertown, SD

That's the driving distance. It would take 13 hours 8 mins to go from Longmont, Colorado to Watertown, South Dakota.

The flight distance (direct flight from Longmont, CO to Watertown, SD) is 521.35 mi.

713 mi = 1,147.56 kms