Miles between Decatur, IL and San Marcos, TX

There are
972 mi
from Decatur, IL to San Marcos, TX

That's the driving distance. It would take 18 hours 9 mins to go from Decatur, Illinois to San Marcos, Texas.

The flight distance (direct flight from Decatur, IL to San Marcos, TX) is 855.03 mi.

972 mi = 1,563.49 kms