There are
2,014 mi
from San Marcos, CA to Champaign, IL
That's the driving distance. It would take 1 day 11 hours to go from San Marcos, California to Champaign, Illinois.
The flight distance (direct flight from San Marcos, CA to Champaign, IL) is 1,666.07 mi.
2,014 mi = 3,240.95 kms