Miles between St Charles, MO and Boulder, CO

There are
847 mi
from St Charles, MO to Boulder, CO

That's the driving distance. It would take 14 hours 57 mins to go from St Charles, Missouri to Boulder, Colorado.

The flight distance (direct flight from St Charles, MO to Boulder, CO) is 791.60 mi.

847 mi = 1,363.67 kms