| Ostend to Montemor-o-Novo | 1,022.95 mi (1,646.27 km) |
| Ostend to Montemor-o-Velho | 944.88 mi (1,520.63 km) |
| Ostend to Montijo | 1,038.77 mi (1,671.75 km) |
| Ostend to Mortagua | 916.69 mi (1,475.26 km) |
| Ostend to Moura | 1,035.87 mi (1,667.07 km) |
| Ostend to Murtosa | 910.54 mi (1,465.37 km) |
| Ostend to Nazare | 988.86 mi (1,591.41 km) |
| Ostend to Nelas | 901.24 mi (1,450.40 km) |
| Ostend to Obidos | 1,005.64 mi (1,618.42 km) |
| Ostend to Odemira | 1,098.72 mi (1,768.22 km) |
| Ostend to Odivelas | 1,039.91 mi (1,673.57 km) |
| Ostend to Oeiras | 1,050.02 mi (1,689.85 km) |
| Ostend to Olhao | 1,114.17 mi (1,793.09 km) |
| Ostend to Oliveira de Azemeis | 899.83 mi (1,448.14 km) |
| Ostend to Oliveira de Frades | 898.71 mi (1,446.33 km) |
