| Siano to Setubal | 1,260.53 mi (2,028.62 km) |
| Siano to Sever do Vouga | 1,203.26 mi (1,936.46 km) |
| Siano to Silves | 1,263.21 mi (2,032.94 km) |
| Siano to Sines | 1,269.55 mi (2,043.15 km) |
| Siano to Sintra | 1,281.77 mi (2,062.81 km) |
| Siano to Sobrado de Paiva | 1,195.44 mi (1,923.87 km) |
| Siano to Sobral de Monte Agraco | 1,265.88 mi (2,037.24 km) |
| Siano to Soure | 1,224.44 mi (1,970.55 km) |
| Siano to Tabua | 1,189.47 mi (1,914.27 km) |
| Siano to Tavira | 1,223.63 mi (1,969.24 km) |
| Siano to Tomar | 1,218.91 mi (1,961.65 km) |
| Siano to Tondela | 1,190.66 mi (1,916.18 km) |
| Siano to Torre de Moncorvo | 1,135.53 mi (1,827.46 km) |
| Siano to Torres Novas | 1,226.85 mi (1,974.42 km) |
| Siano to Torres Vedras | 1,270.85 mi (2,045.24 km) |
