| Slough to Mancha Real | 959.47 mi (1,544.11 km) |
| Slough to Manilva | 1,069.91 mi (1,721.85 km) |
| Slough to Manises | 830.88 mi (1,337.17 km) |
| Slough to Manlleu | 670.74 mi (1,079.46 km) |
| Slough to Manresa | 685.44 mi (1,103.10 km) |
| Slough to Manzanares | 874.87 mi (1,407.97 km) |
| Slough to Manzanares el Real | 761.02 mi (1,224.74 km) |
| Slough to Maracena | 999.77 mi (1,608.97 km) |
| Slough to Marbella | 1,057.11 mi (1,701.26 km) |
| Slough to Marchena | 1,007.41 mi (1,621.26 km) |
| Slough to Marin | 735.88 mi (1,184.28 km) |
| Slough to Marratxi | 835.42 mi (1,344.47 km) |
| Slough to Martorell | 703.44 mi (1,132.08 km) |
| Slough to Martos | 967.02 mi (1,556.27 km) |
| Slough to Masamagrell | 824.94 mi (1,327.61 km) |
