There are
2,042 mi
from Rockford, IL to Suisun City, CA
That's the driving distance. It would take 1 day 11 hours to go from Rockford, Illinois to Suisun City, California.
The flight distance (direct flight from Rockford, IL to Suisun City, CA) is 1,748.30 mi.
2,042 mi = 3.22 kms