There are
2,042 mi
from San Marcos, CA to Rantoul, IL
That's the driving distance. It would take 1 day 11 hours to go from San Marcos, California to Rantoul, Illinois.
The flight distance (direct flight from San Marcos, CA to Rantoul, IL) is 1,672.44 mi.
2,042 mi = 3.22 kms