Miles between Boulder, CO and St George, UT

There are
642 mi
from Boulder, CO to St George, UT

That's the driving distance. It would take 11 hours 11 mins to go from Boulder, Colorado to St George, Utah.

The flight distance (direct flight from Boulder, CO to St George, UT) is 491.82 mi.

642 mi = 1,033.29 kms