| Opera to Montemor-o-Novo | 1,005.66 mi (1,618.45 km) |
| Opera to Montemor-o-Velho | 974.12 mi (1,567.70 km) |
| Opera to Montijo | 1,035.41 mi (1,666.34 km) |
| Opera to Mortagua | 944.60 mi (1,520.19 km) |
| Opera to Moura | 991.55 mi (1,595.75 km) |
| Opera to Murtosa | 954.24 mi (1,535.71 km) |
| Opera to Nazare | 1,010.64 mi (1,626.47 km) |
| Opera to Nelas | 924.04 mi (1,487.09 km) |
| Opera to Obidos | 1,023.12 mi (1,646.55 km) |
| Opera to Odemira | 1,066.14 mi (1,715.78 km) |
| Opera to Odivelas | 1,044.26 mi (1,680.58 km) |
| Opera to Oeiras | 1,054.44 mi (1,696.95 km) |
| Opera to Olhao | 1,054.78 mi (1,697.50 km) |
| Opera to Oliveira de Azemeis | 943.60 mi (1,518.57 km) |
| Opera to Oliveira de Frades | 933.52 mi (1,502.36 km) |
