Miles between Longmont, CO and San Marcos, TX

There are
974 mi
from Longmont, CO to San Marcos, TX

That's the driving distance. It would take 17 hours 54 mins to go from Longmont, Colorado to San Marcos, Texas.

The flight distance (direct flight from Longmont, CO to San Marcos, TX) is 817.23 mi.

974 mi = 1,566.71 kms