Miles between Diamond Bar, CA and Longmont, CO

There are
1,018 mi
from Diamond Bar, CA to Longmont, CO

That's the driving distance. It would take 17 hours 55 mins to go from Diamond Bar, California to Longmont, Colorado.

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

1,018 mi = 1,638.29 kms