Miles between Thornton, CO and Rapid City, SD

There are
397 mi
from Thornton, CO to Rapid City, SD

That's the driving distance. It would take 7 hours 4 mins to go from Thornton, Colorado to Rapid City, South Dakota.

The flight distance (direct flight from Thornton, CO to Rapid City, SD) is 304.46 mi.

397 mi = 639.65 kms