| Romeoville to Sesimbra | 4,031.50 mi (6,488.07 km) |
| Romeoville to Setubal | 4,038.32 mi (6,499.05 km) |
| Romeoville to Sever do Vouga | 3,986.20 mi (6,415.17 km) |
| Romeoville to Silves | 4,107.05 mi (6,609.66 km) |
| Romeoville to Sines | 4,059.71 mi (6,533.46 km) |
| Romeoville to Sintra | 4,005.64 mi (6,446.46 km) |
| Romeoville to Sobrado de Paiva | 3,980.55 mi (6,406.08 km) |
| Romeoville to Sobral de Monte Agraco | 4,009.04 mi (6,451.92 km) |
| Romeoville to Soure | 3,997.37 mi (6,433.14 km) |
| Romeoville to Tabua | 4,014.36 mi (6,460.49 km) |
| Romeoville to Tavira | 4,146.62 mi (6,673.35 km) |
| Romeoville to Tomar | 4,022.85 mi (6,474.15 km) |
| Romeoville to Tondela | 4,006.52 mi (6,447.87 km) |
| Romeoville to Torre de Moncorvo | 4,026.17 mi (6,479.49 km) |
| Romeoville to Torres Novas | 4,022.10 mi (6,472.94 km) |
