Miles between Longmont, CO and Round Lake, IL

There are
1,003 mi
from Longmont, CO to Round Lake, IL

That's the driving distance. It would take 18 hours 14 mins to go from Longmont, Colorado to Round Lake, Illinois.

The flight distance (direct flight from Longmont, CO to Round Lake, IL) is 894.66 mi.

1,003 mi = 1.61 kms