There are
1,010 mi
from Longmont, CO to Sauk Village, IL
That's the driving distance. It would take 18 hours 3 mins to go from Longmont, Colorado to Sauk Village, Illinois.
The flight distance (direct flight from Longmont, CO to Sauk Village, IL) is 919.67 mi.
1,010 mi = 1.61 kms