| Siniscola to Setubal | 998.51 mi (1,606.95 km) |
| Siniscola to Sever do Vouga | 945.22 mi (1,521.19 km) |
| Siniscola to Silves | 1,001.13 mi (1,611.16 km) |
| Siniscola to Sines | 1,007.28 mi (1,621.06 km) |
| Siniscola to Sintra | 1,020.09 mi (1,641.68 km) |
| Siniscola to Sobrado de Paiva | 938.35 mi (1,510.12 km) |
| Siniscola to Sobral de Monte Agraco | 1,004.40 mi (1,616.43 km) |
| Siniscola to Soure | 964.65 mi (1,552.45 km) |
| Siniscola to Tabua | 930.28 mi (1,497.13 km) |
| Siniscola to Tavira | 961.76 mi (1,547.81 km) |
| Siniscola to Tomar | 958.14 mi (1,541.98 km) |
| Siniscola to Tondela | 931.91 mi (1,499.76 km) |
| Siniscola to Torre de Moncorvo | 878.78 mi (1,414.25 km) |
| Siniscola to Torres Novas | 965.87 mi (1,554.42 km) |
| Siniscola to Torres Vedras | 1,009.48 mi (1,624.61 km) |
