Miles between Thornton, CO and St George, UT

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

That's the driving distance. It would take 10 hours 58 mins to go from Thornton, Colorado to St George, Utah.

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

638 mi = 1,026.18 kms