Miles between St Louis, MO and Thornton, CO

There are
851 mi
from St Louis, MO to Thornton, CO

That's the driving distance. It would take 15 hours 3 mins to go from St Louis, Missouri to Thornton, Colorado.

The flight distance (direct flight from St Louis, MO to Thornton, CO) is 794.16 mi.

851 mi = 1,370.14 kms