| South Houston to Sesimbra | 4,787.51 mi (7,704.75 km) |
| South Houston to Setubal | 4,795.79 mi (7,718.07 km) |
| South Houston to Sever do Vouga | 4,764.89 mi (7,668.35 km) |
| South Houston to Silves | 4,853.97 mi (7,811.71 km) |
| South Houston to Sines | 4,812.09 mi (7,744.32 km) |
| South Houston to Sintra | 4,763.88 mi (7,666.73 km) |
| South Houston to Sobrado de Paiva | 4,762.12 mi (7,663.89 km) |
| South Houston to Sobral de Monte Agraco | 4,770.07 mi (7,676.68 km) |
| South Houston to Soure | 4,769.29 mi (7,675.43 km) |
| South Houston to Tabua | 4,790.91 mi (7,710.22 km) |
| South Houston to Tavira | 4,895.86 mi (7,879.12 km) |
| South Houston to Tomar | 4,791.53 mi (7,711.23 km) |
| South Houston to Tondela | 4,784.24 mi (7,699.49 km) |
| South Houston to Torre de Moncorvo | 4,812.59 mi (7,745.11 km) |
| South Houston to Torres Novas | 4,789.22 mi (7,707.51 km) |
