Miles between San Marcos, CA and Longmont, CO

There are
1,072 mi
from San Marcos, CA to Longmont, CO

That's the driving distance. It would take 18 hours 58 mins to go from San Marcos, California to Longmont, Colorado.

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

1,072 mi = 1.61 kms