Miles between Rapid City, SD and Thornton, CO

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

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

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

398 mi = 640.63 kms