Miles between St George, UT and Thornton, CO

There are
638 mi
from St George, UT to Thornton, CO

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

The flight distance (direct flight from St George, UT to Thornton, CO) is 503.07 mi.

638 mi = 1,026.10 kms