There are
1,950 mi
from Rockford, IL to Susanville, CA
That's the driving distance. It would take 1 day 9 hours to go from Rockford, Illinois to Susanville, California.
The flight distance (direct flight from Rockford, IL to Susanville, CA) is 1,632.67 mi.
1,950 mi = 1.61 kms