Miles between Longmont, CO and Mill Valley, CA

There are
1,229 mi
from Longmont, CO to Mill Valley, CA

That's the driving distance. It would take 21 hours 11 mins to go from Longmont, Colorado to Mill Valley, California.

The flight distance (direct flight from Longmont, CO to Mill Valley, CA) is 947.48 mi.

1,229 mi = 1.61 kms