| Somain to Setubal | 1,011.63 mi (1,628.07 km) |
| Somain to Sever do Vouga | 869.58 mi (1,399.46 km) |
| Somain to Silves | 1,078.76 mi (1,736.10 km) |
| Somain to Sines | 1,044.37 mi (1,680.74 km) |
| Somain to Sintra | 1,010.22 mi (1,625.79 km) |
| Somain to Sobrado de Paiva | 849.82 mi (1,367.65 km) |
| Somain to Sobral de Monte Agraco | 990.59 mi (1,594.20 km) |
| Somain to Soure | 916.13 mi (1,474.37 km) |
| Somain to Tabua | 880.33 mi (1,416.75 km) |
| Somain to Tavira | 1,062.67 mi (1,710.21 km) |
| Somain to Tomar | 935.34 mi (1,505.29 km) |
| Somain to Tondela | 873.08 mi (1,405.09 km) |
| Somain to Torre de Moncorvo | 805.95 mi (1,297.05 km) |
| Somain to Torres Novas | 946.45 mi (1,523.17 km) |
| Somain to Torres Vedras | 990.28 mi (1,593.69 km) |
