| Merthyr Tudful to Los Llanos de Aridane | 1,762.58 mi (2,836.60 km) |
| Merthyr Tudful to Los Palacios y Villafranca | 1,015.05 mi (1,633.56 km) |
| Merthyr Tudful to Luanco | 572.94 mi (922.06 km) |
| Merthyr Tudful to Lucena | 992.47 mi (1,597.22 km) |
| Merthyr Tudful to Lugo | 633.46 mi (1,019.46 km) |
| Merthyr Tudful to Lumbreras | 982.70 mi (1,581.50 km) |
| Merthyr Tudful to Madrid | 782.71 mi (1,259.65 km) |
| Merthyr Tudful to Madridejos | 848.24 mi (1,365.11 km) |
| Merthyr Tudful to Mahon | 896.70 mi (1,443.10 km) |
| Merthyr Tudful to Mairena del Alcor | 999.91 mi (1,609.20 km) |
| Merthyr Tudful to Mairena del Aljarafe | 1,004.20 mi (1,616.10 km) |
| Merthyr Tudful to Majadahonda | 779.05 mi (1,253.76 km) |
| Merthyr Tudful to Malaga | 1,039.28 mi (1,672.56 km) |
| Merthyr Tudful to Malgrat de Mar | 754.90 mi (1,214.90 km) |
| Merthyr Tudful to Manacor | 898.31 mi (1,445.69 km) |
