| Romeoville to Sinop | 5,661.01 mi (9,110.52 km) |
| Romeoville to Siran | 5,888.29 mi (9,476.28 km) |
| Romeoville to Sirnak | 6,142.61 mi (9,885.57 km) |
| Romeoville to Sirvan | 6,098.33 mi (9,814.32 km) |
| Romeoville to Sivas | 5,844.76 mi (9,406.24 km) |
| Romeoville to Sivasli | 5,659.58 mi (9,108.22 km) |
| Romeoville to Siverek | 6,029.74 mi (9,703.93 km) |
| Romeoville to Sivrice | 5,990.87 mi (9,641.38 km) |
| Romeoville to Sivrihisar | 5,675.46 mi (9,133.77 km) |
| Romeoville to Sogut | 5,598.34 mi (9,009.66 km) |
| Romeoville to Sogutlu | 5,563.47 mi (8,953.55 km) |
| Romeoville to Soke | 5,613.47 mi (9,034.01 km) |
| Romeoville to Solhan | 6,016.90 mi (9,683.27 km) |
| Romeoville to Soma | 5,548.25 mi (8,929.04 km) |
| Romeoville to Sorgun | 5,781.02 mi (9,303.65 km) |
