| Duncan to Montalegre | 4,689.41 mi (7,546.87 km) |
| Duncan to Montemor-o-Novo | 4,771.39 mi (7,678.81 km) |
| Duncan to Montemor-o-Velho | 4,700.56 mi (7,564.82 km) |
| Duncan to Montijo | 4,737.75 mi (7,624.67 km) |
| Duncan to Mortagua | 4,713.12 mi (7,585.04 km) |
| Duncan to Moura | 4,824.89 mi (7,764.91 km) |
| Duncan to Murtosa | 4,684.96 mi (7,539.72 km) |
| Duncan to Nazare | 4,700.51 mi (7,564.74 km) |
| Duncan to Nelas | 4,728.31 mi (7,609.49 km) |
| Duncan to Obidos | 4,703.88 mi (7,570.17 km) |
| Duncan to Odemira | 4,786.25 mi (7,702.73 km) |
| Duncan to Odivelas | 4,720.96 mi (7,597.66 km) |
| Duncan to Oeiras | 4,717.84 mi (7,592.63 km) |
| Duncan to Olhao | 4,842.91 mi (7,793.91 km) |
| Duncan to Oliveira de Azemeis | 4,688.96 mi (7,546.15 km) |
