Miles between Longmont, CO and St Charles, MO

There are
855 mi
from Longmont, CO to St Charles, MO

That's the driving distance. It would take 15 hours to go from Longmont, Colorado to St Charles, Missouri.

The flight distance (direct flight from Longmont, CO to St Charles, MO) is 783.01 mi.

855 mi = 1,376.16 kms