Miles between San Marcos, CA and Boulder, CO

There are
1,058 mi
from San Marcos, CA to Boulder, CO

That's the driving distance. It would take 18 hours 45 mins to go from San Marcos, California to Boulder, Colorado.

The flight distance (direct flight from San Marcos, CA to Boulder, CO) is 811.82 mi.

1,058 mi = 1.61 kms