490.01 miles (788.6 kilometres)
It is 717 miles according to Google Maps.
The Distance between Atlanta (Georgia,Fulton County,US) and Chester (Illinois,Randolph County,US) is :418.71 miles. (673.84 kilometers (km).
By car, if you use I-24 W it is 637 miles. If you average 60 mph, it will take you 10 hours and 37 minutes. If you average 50 mph, it will take you 12 hours and 40.083 minutes.