| Merthyr Tudful to La Union | 983.42 mi (1,582.66 km) |
| Merthyr Tudful to La Victoria de Acentejo | 1,746.59 mi (2,810.87 km) |
| Merthyr Tudful to Laguna de Duero | 704.80 mi (1,134.26 km) |
| Merthyr Tudful to Lalin | 666.13 mi (1,072.03 km) |
| Merthyr Tudful to Lardero | 645.16 mi (1,038.29 km) |
| Merthyr Tudful to Laredo | 575.45 mi (926.10 km) |
| Merthyr Tudful to Las Cabezas de San Juan | 1,027.56 mi (1,653.70 km) |
| Merthyr Tudful to Las Palmas | 1,746.85 mi (2,811.28 km) |
| Merthyr Tudful to Las Rozas de Madrid | 777.75 mi (1,251.66 km) |
| Merthyr Tudful to Las Torres de Cotillas | 953.36 mi (1,534.28 km) |
| Merthyr Tudful to Lebrija | 1,032.68 mi (1,661.94 km) |
| Merthyr Tudful to Leganes | 788.91 mi (1,269.62 km) |
| Merthyr Tudful to Leon | 639.59 mi (1,029.33 km) |
| Merthyr Tudful to Lepe | 1,018.31 mi (1,638.81 km) |
| Merthyr Tudful to Linares | 943.87 mi (1,519.02 km) |
