There are
1,015 mi
from Longmont, CO to Lindenhurst, IL
That's the driving distance. It would take 18 hours 21 mins to go from Longmont, Colorado to Lindenhurst, Illinois.
The flight distance (direct flight from Longmont, CO to Lindenhurst, IL) is 898.36 mi.
1,015 mi = 1.61 kms