Miles between Longmont, CO and Grayslake, IL

There are
1,006 mi
from Longmont, CO to Grayslake, IL

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

The flight distance (direct flight from Longmont, CO to Grayslake, IL) is 897.25 mi.

1,006 mi = 1.61 kms