There are
2,095 mi
from South San Francisco, CA to Rockford, IL
That's the driving distance. It would take 1 day 12 hours to go from South San Francisco, California to Rockford, Illinois.
The flight distance (direct flight from South San Francisco, CA to Rockford, IL) is 1,781.08 mi.
2,095 mi = 3,372.10 kms