Miles between Longmont, CO and Duarte, CA

There are
1,023 mi
from Longmont, CO to Duarte, CA

That's the driving distance. It would take 17 hours 58 mins to go from Longmont, Colorado to Duarte, California.

The flight distance (direct flight from Longmont, CO to Duarte, CA) is 821.04 mi.

1,023 mi = 1.61 kms