Miles between Longmont, CO and San Marcos, CA

There are
1,073 mi
from Longmont, CO to San Marcos, CA

That's the driving distance. It would take 18 hours 55 mins to go from Longmont, Colorado to San Marcos, California.

The flight distance (direct flight from Longmont, CO to San Marcos, CA) is 824.98 mi.

1,073 mi = 1.61 kms