There are
1,013 mi
from Longmont, CO to Pewaukee, WI
That's the driving distance. It would take 18 hours 31 mins to go from Longmont, Colorado to Pewaukee, Wisconsin.
The flight distance (direct flight from Longmont, CO to Pewaukee, WI) is 893.12 mi.
1,013 mi = 1.61 kms