Miles between Rapid City, SD and Boulder, CO

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

That's the driving distance. It would take 7 hours 10 mins to go from Rapid City, South Dakota to Boulder, Colorado.

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

398 mi = 640.00 kms