| Seaham to Montalegre | 945.96 mi (1,522.38 km) |
| Seaham to Montemor-o-Novo | 1,163.67 mi (1,872.75 km) |
| Seaham to Montemor-o-Velho | 1,068.78 mi (1,720.03 km) |
| Seaham to Montijo | 1,170.63 mi (1,883.94 km) |
| Seaham to Mortagua | 1,044.63 mi (1,681.17 km) |
| Seaham to Moura | 1,189.24 mi (1,913.90 km) |
| Seaham to Murtosa | 1,030.46 mi (1,658.37 km) |
| Seaham to Nazare | 1,112.04 mi (1,789.65 km) |
| Seaham to Nelas | 1,033.85 mi (1,663.82 km) |
| Seaham to Obidos | 1,129.44 mi (1,817.66 km) |
| Seaham to Odemira | 1,240.65 mi (1,996.63 km) |
| Seaham to Odivelas | 1,167.49 mi (1,878.90 km) |
| Seaham to Oeiras | 1,176.61 mi (1,893.58 km) |
| Seaham to Olhao | 1,268.52 mi (2,041.49 km) |
| Seaham to Oliveira de Azemeis | 1,021.05 mi (1,643.22 km) |
