Miles between Thornton, CO and San Marcos, CA

There are
1,055 mi
from Thornton, CO to San Marcos, CA

That's the driving distance. It would take 18 hours 29 mins to go from Thornton, Colorado to San Marcos, California.

The flight distance (direct flight from Thornton, CO to San Marcos, CA) is 820.06 mi.

1,055 mi = 1.61 kms