| Port Royal to Montalegre | 3,951.45 mi (6,359.24 km) |
| Port Royal to Montemor-o-Novo | 3,994.03 mi (6,427.77 km) |
| Port Royal to Montemor-o-Velho | 3,939.15 mi (6,339.45 km) |
| Port Royal to Montijo | 3,958.21 mi (6,370.12 km) |
| Port Royal to Mortagua | 3,956.56 mi (6,367.47 km) |
| Port Royal to Moura | 4,044.61 mi (6,509.17 km) |
| Port Royal to Murtosa | 3,930.54 mi (6,325.59 km) |
| Port Royal to Nazare | 3,930.98 mi (6,326.29 km) |
| Port Royal to Nelas | 3,974.18 mi (6,395.82 km) |
| Port Royal to Obidos | 3,931.19 mi (6,326.63 km) |
| Port Royal to Odemira | 3,995.34 mi (6,429.88 km) |
| Port Royal to Odivelas | 3,941.61 mi (6,343.41 km) |
| Port Royal to Oeiras | 3,936.76 mi (6,335.60 km) |
| Port Royal to Olhao | 4,048.90 mi (6,516.08 km) |
| Port Royal to Oliveira de Azemeis | 3,936.41 mi (6,335.04 km) |
