| Siano to Bombarral | 1,262.22 mi (2,031.34 km) |
| Siano to Bougado | 1,208.20 mi (1,944.42 km) |
| Siano to Braga | 1,199.60 mi (1,930.57 km) |
| Siano to Braganca | 1,112.77 mi (1,790.83 km) |
| Siano to Cabeceiras de Basto | 1,178.93 mi (1,897.31 km) |
| Siano to Cacem | 1,278.06 mi (2,056.84 km) |
| Siano to Cadaval | 1,259.85 mi (2,027.53 km) |
| Siano to Caldas da Rainha | 1,259.16 mi (2,026.41 km) |
| Siano to Calheta | 1,838.03 mi (2,958.02 km) |
| Siano to Camara de Lobos | 1,829.25 mi (2,943.89 km) |
| Siano to Canico | 1,824.32 mi (2,935.97 km) |
| Siano to Cantanhede | 1,219.00 mi (1,961.80 km) |
| Siano to Carregal do Sal | 1,187.18 mi (1,910.59 km) |
| Siano to Cartaxo | 1,244.56 mi (2,002.93 km) |
| Siano to Cascais | 1,284.92 mi (2,067.87 km) |
