| Sinnai to Oliveira do Bairro | 940.39 mi (1,513.41 km) |
| Sinnai to Oliveira do Hospital | 907.01 mi (1,459.70 km) |
| Sinnai to Ourem | 946.46 mi (1,523.18 km) |
| Sinnai to Ovar | 947.39 mi (1,524.67 km) |
| Sinnai to Pacos de Ferreira | 936.02 mi (1,506.38 km) |
| Sinnai to Palmela | 972.66 mi (1,565.34 km) |
| Sinnai to Paredes | 932.37 mi (1,500.50 km) |
| Sinnai to Paredes de Coura | 947.35 mi (1,524.61 km) |
| Sinnai to Penacova | 929.31 mi (1,495.58 km) |
| Sinnai to Penafiel | 929.82 mi (1,496.40 km) |
| Sinnai to Peniche | 990.75 mi (1,594.46 km) |
| Sinnai to Peso da Regua | 903.33 mi (1,453.77 km) |
| Sinnai to Pinhal Novo | 972.74 mi (1,565.48 km) |
| Sinnai to Pinhel | 865.39 mi (1,392.71 km) |
| Sinnai to Pombal | 948.53 mi (1,526.50 km) |
