Miles between Boulder, CO and Rapid City, SD

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

That's the driving distance. It would take 7 hours 11 mins to go from Boulder, Colorado to Rapid City, South Dakota.

The flight distance (direct flight from Boulder, CO to Rapid City, SD) is 299.74 mi.

398 mi = 639.89 kms