| Siano to Oliveira do Bairro | 1,212.31 mi (1,951.02 km) |
| Siano to Oliveira do Hospital | 1,180.82 mi (1,900.34 km) |
| Siano to Ourem | 1,226.06 mi (1,973.16 km) |
| Siano to Ovar | 1,215.85 mi (1,956.73 km) |
| Siano to Pacos de Ferreira | 1,200.51 mi (1,932.03 km) |
| Siano to Palmela | 1,260.18 mi (2,028.06 km) |
| Siano to Paredes | 1,197.56 mi (1,927.29 km) |
| Siano to Paredes de Coura | 1,204.86 mi (1,939.03 km) |
| Siano to Penacova | 1,203.67 mi (1,937.12 km) |
| Siano to Penafiel | 1,194.97 mi (1,923.12 km) |
| Siano to Peniche | 1,272.04 mi (2,047.16 km) |
| Siano to Peso da Regua | 1,169.04 mi (1,881.39 km) |
| Siano to Pinhal Novo | 1,259.80 mi (2,027.46 km) |
| Siano to Pinhel | 1,135.36 mi (1,827.18 km) |
| Siano to Pombal | 1,225.81 mi (1,972.75 km) |
