Miles between Thornton, CO and Pierre, SD

There are
518 mi
from Thornton, CO to Pierre, SD

That's the driving distance. It would take 9 hours 23 mins to go from Thornton, Colorado to Pierre, South Dakota.

The flight distance (direct flight from Thornton, CO to Pierre, SD) is 390.72 mi.

518 mi = 833.75 kms