Miles between Longmont, CO and Diamond Bar, CA

There are
1,019 mi
from Longmont, CO to Diamond Bar, CA

That's the driving distance. It would take 17 hours 53 mins to go from Longmont, Colorado to Diamond Bar, California.

The flight distance (direct flight from Longmont, CO to Diamond Bar, CA) is 817.52 mi.

1,019 mi = 1.61 kms