| Opwijk to Montemor-o-Novo | 1,042.74 mi (1,678.13 km) |
| Opwijk to Montemor-o-Velho | 968.81 mi (1,559.15 km) |
| Opwijk to Montijo | 1,060.29 mi (1,706.38 km) |
| Opwijk to Mortagua | 940.08 mi (1,512.92 km) |
| Opwijk to Moura | 1,052.81 mi (1,694.34 km) |
| Opwijk to Murtosa | 935.59 mi (1,505.69 km) |
| Opwijk to Nazare | 1,012.54 mi (1,629.52 km) |
| Opwijk to Nelas | 923.84 mi (1,486.77 km) |
| Opwijk to Obidos | 1,029.05 mi (1,656.10 km) |
| Opwijk to Odemira | 1,117.68 mi (1,798.73 km) |
| Opwijk to Odivelas | 1,062.29 mi (1,709.59 km) |
| Opwijk to Oeiras | 1,072.52 mi (1,726.06 km) |
| Opwijk to Olhao | 1,130.32 mi (1,819.07 km) |
| Opwijk to Oliveira de Azemeis | 924.74 mi (1,488.22 km) |
| Opwijk to Oliveira de Frades | 922.61 mi (1,484.80 km) |
