| Sinnai to Setubal | 972.71 mi (1,565.42 km) |
| Sinnai to Sever do Vouga | 933.36 mi (1,502.10 km) |
| Sinnai to Silves | 966.83 mi (1,555.96 km) |
| Sinnai to Sines | 978.01 mi (1,573.96 km) |
| Sinnai to Sintra | 996.41 mi (1,603.56 km) |
| Sinnai to Sobrado de Paiva | 928.50 mi (1,494.28 km) |
| Sinnai to Sobral de Monte Agraco | 981.86 mi (1,580.15 km) |
| Sinnai to Soure | 948.33 mi (1,526.19 km) |
| Sinnai to Tabua | 915.79 mi (1,473.82 km) |
| Sinnai to Tavira | 925.93 mi (1,490.14 km) |
| Sinnai to Tomar | 938.76 mi (1,510.79 km) |
| Sinnai to Tondela | 918.50 mi (1,478.19 km) |
| Sinnai to Torre de Moncorvo | 870.06 mi (1,400.22 km) |
| Sinnai to Torres Novas | 945.70 mi (1,521.96 km) |
| Sinnai to Torres Vedras | 987.43 mi (1,589.12 km) |
