Miles between St Louis, MO and Longmont, CO

There are
877 mi
from St Louis, MO to Longmont, CO

That's the driving distance. It would take 15 hours 26 mins to go from St Louis, Missouri to Longmont, Colorado.

The flight distance (direct flight from St Louis, MO to Longmont, CO) is 801.81 mi.

877 mi = 1,410.84 kms