| Middlesbrough to Montijo | 1,111.24 mi (1,788.37 km) |
| Middlesbrough to Montilla | 1,185.02 mi (1,907.10 km) |
| Middlesbrough to Montmelo | 913.72 mi (1,470.49 km) |
| Middlesbrough to Montornes del Valles | 914.56 mi (1,471.84 km) |
| Middlesbrough to Montoro | 1,153.72 mi (1,856.73 km) |
| Middlesbrough to Monzon | 877.59 mi (1,412.35 km) |
| Middlesbrough to Mora | 1,035.72 mi (1,666.83 km) |
| Middlesbrough to Moralzarzal | 968.72 mi (1,559.01 km) |
| Middlesbrough to Moron de la Frontera | 1,222.39 mi (1,967.24 km) |
| Middlesbrough to Mostoles | 991.59 mi (1,595.81 km) |
| Middlesbrough to Motril | 1,236.46 mi (1,989.88 km) |
| Middlesbrough to Muchamiel | 1,117.38 mi (1,798.24 km) |
| Middlesbrough to Mula | 1,142.51 mi (1,838.69 km) |
| Middlesbrough to Munguia | 778.75 mi (1,253.28 km) |
| Middlesbrough to Murcia | 1,146.31 mi (1,844.81 km) |
