Miles between Longmont, CO and St Ann, MO

There are
863 mi
from Longmont, CO to St Ann, MO

That's the driving distance. It would take 15 hours 9 mins to go from Longmont, Colorado to St Ann, Missouri.

The flight distance (direct flight from Longmont, CO to St Ann, MO) is 790.44 mi.

863 mi = 1,388.49 kms