| Romeoville to Southern Pines (North Carolina) | 647.09 mi (1,041.40 km) |
| Romeoville to Southfield (Michigan) | 254.99 mi (410.37 km) |
| Romeoville to Southgate (Michigan) | 254.67 mi (409.85 km) |
| Romeoville to Southlake (Texas) | 778.11 mi (1,252.25 km) |
| Romeoville to Spanaway (Washington) | 1,722.23 mi (2,771.67 km) |
| Romeoville to Spanish Fork (Utah) | 1,230.59 mi (1,980.44 km) |
| Romeoville to Spanish Lake (Missouri) | 225.74 mi (363.30 km) |
| Romeoville to Spanish Springs (Nevada) | 1,651.42 mi (2,657.71 km) |
| Romeoville to Sparks (Nevada) | 1,655.32 mi (2,663.99 km) |
| Romeoville to Spartanburg (South Carolina) | 570.29 mi (917.79 km) |
| Romeoville to Spearfish (South Dakota) | 816.16 mi (1,313.48 km) |
| Romeoville to Speedway (Indiana) | 159.78 mi (257.14 km) |
| Romeoville to Spencer (Iowa) | 374.73 mi (603.08 km) |
| Romeoville to Spokane (Washington) | 1,490.87 mi (2,399.32 km) |
| Romeoville to Spokane Valley (Washington) | 1,481.65 mi (2,384.48 km) |
