Miles between Longmont, CO and Ontario, OR

There are
846 mi
from Longmont, CO to Ontario, OR

That's the driving distance. It would take 14 hours 6 mins to go from Longmont, Colorado to Ontario, Oregon.

The flight distance (direct flight from Longmont, CO to Ontario, OR) is 663.18 mi.

846 mi = 1,360.97 kms