Miles between Longmont, CO and Round Lake Beach, IL

There are
1,005 mi
from Longmont, CO to Round Lake Beach, IL

That's the driving distance. It would take 18 hours 17 mins to go from Longmont, Colorado to Round Lake Beach, Illinois.

The flight distance (direct flight from Longmont, CO to Round Lake Beach, IL) is 894.91 mi.

1,005 mi = 1.61 kms