Miles between Longmont, CO and Lake Forest, IL

There are
1,019 mi
from Longmont, CO to Lake Forest, IL

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

The flight distance (direct flight from Longmont, CO to Lake Forest, IL) is 907.13 mi.

1,019 mi = 1.61 kms