| Williamstown to Sesimbra | 3,451.73 mi (5,555.02 km) |
| Williamstown to Setubal | 3,459.78 mi (5,567.98 km) |
| Williamstown to Sever do Vouga | 3,426.69 mi (5,514.72 km) |
| Williamstown to Silves | 3,520.04 mi (5,664.95 km) |
| Williamstown to Sines | 3,476.99 mi (5,595.68 km) |
| Williamstown to Sintra | 3,427.71 mi (5,516.37 km) |
| Williamstown to Sobrado de Paiva | 3,423.82 mi (5,510.11 km) |
| Williamstown to Sobral de Monte Agraco | 3,433.49 mi (5,525.67 km) |
| Williamstown to Soure | 3,431.50 mi (5,522.47 km) |
| Williamstown to Tabua | 3,452.82 mi (5,556.78 km) |
| Williamstown to Tavira | 3,561.51 mi (5,731.70 km) |
| Williamstown to Tomar | 3,454.06 mi (5,558.77 km) |
| Williamstown to Tondela | 3,446.09 mi (5,545.94 km) |
| Williamstown to Torre de Moncorvo | 3,474.25 mi (5,591.27 km) |
| Williamstown to Torres Novas | 3,451.91 mi (5,555.31 km) |
