| Opatija to Montemor-o-Novo | 1,239.88 mi (1,995.40 km) |
| Opatija to Montemor-o-Velho | 1,214.69 mi (1,954.86 km) |
| Opatija to Montijo | 1,271.05 mi (2,045.56 km) |
| Opatija to Mortagua | 1,185.49 mi (1,907.87 km) |
| Opatija to Moura | 1,221.80 mi (1,966.29 km) |
| Opatija to Murtosa | 1,196.46 mi (1,925.51 km) |
| Opatija to Nazare | 1,249.85 mi (2,011.44 km) |
| Opatija to Nelas | 1,164.75 mi (1,874.48 km) |
| Opatija to Obidos | 1,261.64 mi (2,030.41 km) |
| Opatija to Odemira | 1,296.70 mi (2,086.83 km) |
| Opatija to Odivelas | 1,280.79 mi (2,061.22 km) |
| Opatija to Oeiras | 1,290.79 mi (2,077.33 km) |
| Opatija to Olhao | 1,280.75 mi (2,061.16 km) |
| Opatija to Oliveira de Azemeis | 1,185.96 mi (1,908.62 km) |
| Opatija to Oliveira de Frades | 1,175.24 mi (1,891.37 km) |
