Miles between St George, UT and Boulder, CO

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

That's the driving distance. It would take 11 hours 13 mins to go from St George, Utah to Boulder, Colorado.

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

642 mi = 1,032.50 kms