There are
1,222 mi
from Longmont, CO to Milwaukie, OR
That's the driving distance. It would take 21 hours 5 mins to go from Longmont, Colorado to Milwaukie, Oregon.
The flight distance (direct flight from Longmont, CO to Milwaukie, OR) is 958.34 mi.
1,222 mi = 1.61 kms