| Siano to Montemor-o-Novo | 1,223.01 mi (1,968.25 km) |
| Siano to Montemor-o-Velho | 1,225.67 mi (1,972.52 km) |
| Siano to Montijo | 1,258.18 mi (2,024.85 km) |
| Siano to Mortagua | 1,199.31 mi (1,930.11 km) |
| Siano to Moura | 1,192.18 mi (1,918.64 km) |
| Siano to Murtosa | 1,217.09 mi (1,958.71 km) |
| Siano to Nazare | 1,252.83 mi (2,016.24 km) |
| Siano to Nelas | 1,178.54 mi (1,896.67 km) |
| Siano to Obidos | 1,261.02 mi (2,029.41 km) |
| Siano to Odemira | 1,264.91 mi (2,035.68 km) |
| Siano to Odivelas | 1,271.01 mi (2,045.50 km) |
| Siano to Oeiras | 1,279.97 mi (2,059.91 km) |
| Siano to Olhao | 1,235.62 mi (1,988.54 km) |
| Siano to Oliveira de Azemeis | 1,207.89 mi (1,943.92 km) |
| Siano to Oliveira de Frades | 1,193.90 mi (1,921.40 km) |
