Miles between San Marcos, CA and Decatur, IL

There are
1,968 mi
from San Marcos, CA to Decatur, IL

That's the driving distance. It would take 1 day 10 hours to go from San Marcos, California to Decatur, Illinois.

The flight distance (direct flight from San Marcos, CA to Decatur, IL) is 1,626.21 mi.

1,968 mi = 1.61 kms