Miles between Boulder, CO and San Marcos, TX

There are
977 mi
from Boulder, CO to San Marcos, TX

That's the driving distance. It would take 17 hours 46 mins to go from Boulder, Colorado to San Marcos, Texas.

The flight distance (direct flight from Boulder, CO to San Marcos, TX) is 813.12 mi.

977 mi = 1,572.28 kms