| Siano to Castelo Branco | 1,168.23 mi (1,880.09 km) |
| Siano to Castro Daire | 1,179.29 mi (1,897.89 km) |
| Siano to Celorico de Basto | 1,179.04 mi (1,897.48 km) |
| Siano to Chamusca | 1,225.91 mi (1,972.91 km) |
| Siano to Chaves | 1,149.71 mi (1,850.28 km) |
| Siano to Cinfaes | 1,188.00 mi (1,911.90 km) |
| Siano to Coimbra | 1,211.93 mi (1,950.41 km) |
| Siano to Condeixa-a-Nova | 1,216.71 mi (1,958.10 km) |
| Siano to Corroios | 1,272.47 mi (2,047.84 km) |
| Siano to Coruche | 1,234.18 mi (1,986.22 km) |
| Siano to Costa de Caparica | 1,276.39 mi (2,054.15 km) |
| Siano to Covilha | 1,162.76 mi (1,871.29 km) |
| Siano to Eiras | 1,211.31 mi (1,949.41 km) |
| Siano to Elvas | 1,163.63 mi (1,872.68 km) |
| Siano to Entroncamento | 1,223.46 mi (1,968.98 km) |
