| Southborough to Sesimbra | 989.47 mi (1,592.39 km) |
| Southborough to Setubal | 979.80 mi (1,576.83 km) |
| Southborough to Sever do Vouga | 829.93 mi (1,335.64 km) |
| Southborough to Silves | 1,055.65 mi (1,698.90 km) |
| Southborough to Sines | 1,015.26 mi (1,633.90 km) |
| Southborough to Sintra | 973.78 mi (1,567.15 km) |
| Southborough to Sobrado de Paiva | 809.10 mi (1,302.12 km) |
| Southborough to Sobral de Monte Agraco | 954.67 mi (1,536.39 km) |
| Southborough to Soure | 878.44 mi (1,413.71 km) |
| Southborough to Tabua | 845.29 mi (1,360.36 km) |
| Southborough to Tavira | 1,045.19 mi (1,682.06 km) |
| Southborough to Tomar | 901.57 mi (1,450.93 km) |
| Southborough to Tondela | 836.76 mi (1,346.64 km) |
| Southborough to Torre de Moncorvo | 772.92 mi (1,243.89 km) |
| Southborough to Torres Novas | 912.53 mi (1,468.58 km) |
