| Middlesbrough to Montalegre | 930.49 mi (1,497.47 km) |
| Middlesbrough to Montemor-o-Novo | 1,147.85 mi (1,847.29 km) |
| Middlesbrough to Montemor-o-Velho | 1,053.44 mi (1,695.34 km) |
| Middlesbrough to Montijo | 1,155.12 mi (1,858.99 km) |
| Middlesbrough to Mortagua | 1,029.11 mi (1,656.19 km) |
| Middlesbrough to Moura | 1,173.01 mi (1,887.79 km) |
| Middlesbrough to Murtosa | 1,015.21 mi (1,633.82 km) |
| Middlesbrough to Nazare | 1,096.78 mi (1,765.10 km) |
| Middlesbrough to Nelas | 1,018.15 mi (1,638.55 km) |
| Middlesbrough to Obidos | 1,114.19 mi (1,793.11 km) |
| Middlesbrough to Odemira | 1,224.86 mi (1,971.22 km) |
| Middlesbrough to Odivelas | 1,152.14 mi (1,854.19 km) |
| Middlesbrough to Oeiras | 1,161.31 mi (1,868.95 km) |
| Middlesbrough to Olhao | 1,252.33 mi (2,015.44 km) |
| Middlesbrough to Oliveira de Azemeis | 1,005.74 mi (1,618.58 km) |
