| Opglabbeek to Montemor-o-Novo | 1,087.56 mi (1,750.26 km) |
| Opglabbeek to Montemor-o-Velho | 1,016.75 mi (1,636.31 km) |
| Opglabbeek to Montijo | 1,106.35 mi (1,780.50 km) |
| Opglabbeek to Mortagua | 987.70 mi (1,589.55 km) |
| Opglabbeek to Moura | 1,095.45 mi (1,762.95 km) |
| Opglabbeek to Murtosa | 984.37 mi (1,584.19 km) |
| Opglabbeek to Nazare | 1,060.23 mi (1,706.27 km) |
| Opglabbeek to Nelas | 970.93 mi (1,562.56 km) |
| Opglabbeek to Obidos | 1,076.53 mi (1,732.50 km) |
| Opglabbeek to Odemira | 1,161.74 mi (1,869.64 km) |
| Opglabbeek to Odivelas | 1,108.96 mi (1,784.70 km) |
| Opglabbeek to Oeiras | 1,119.27 mi (1,801.29 km) |
| Opglabbeek to Olhao | 1,172.19 mi (1,886.46 km) |
| Opglabbeek to Oliveira de Azemeis | 973.43 mi (1,566.59 km) |
| Opglabbeek to Oliveira de Frades | 970.61 mi (1,562.05 km) |
