Miles between Boulder, CO and Round Lake Beach, IL

There are
1,021 mi
from Boulder, CO to Round Lake Beach, IL

That's the driving distance. It would take 18 hours 22 mins to go from Boulder, Colorado to Round Lake Beach, Illinois.

The flight distance (direct flight from Boulder, CO to Round Lake Beach, IL) is 906.35 mi.

1,021 mi = 1.61 kms