| Holyhead to Montijo | 999.30 mi (1,608.22 km) |
| Holyhead to Montilla | 1,086.54 mi (1,748.62 km) |
| Holyhead to Montmelo | 872.55 mi (1,404.24 km) |
| Holyhead to Montornes del Valles | 873.51 mi (1,405.78 km) |
| Holyhead to Montoro | 1,056.66 mi (1,700.53 km) |
| Holyhead to Monzon | 818.53 mi (1,317.30 km) |
| Holyhead to Mora | 942.26 mi (1,516.42 km) |
| Holyhead to Moralzarzal | 873.47 mi (1,405.72 km) |
| Holyhead to Moron de la Frontera | 1,119.09 mi (1,801.00 km) |
| Holyhead to Mostoles | 897.25 mi (1,443.99 km) |
| Holyhead to Motril | 1,145.38 mi (1,843.31 km) |
| Holyhead to Muchamiel | 1,048.25 mi (1,686.99 km) |
| Holyhead to Mula | 1,065.44 mi (1,714.66 km) |
| Holyhead to Munguia | 692.59 mi (1,114.62 km) |
| Holyhead to Murcia | 1,071.81 mi (1,724.91 km) |
