Miles between Longmont, CO and Alton, IL

There are
882 mi
from Longmont, CO to Alton, IL

That's the driving distance. It would take 15 hours 34 mins to go from Longmont, Colorado to Alton, Illinois.

The flight distance (direct flight from Longmont, CO to Alton, IL) is 798.91 mi.

882 mi = 1,419.37 kms