| Merthyr Tudful to Lagoa | 1,039.34 mi (1,672.65 km) |
| Merthyr Tudful to Lagoa | 1,446.15 mi (2,327.35 km) |
| Merthyr Tudful to Lagos | 1,044.03 mi (1,680.21 km) |
| Merthyr Tudful to Lamego | 764.64 mi (1,230.56 km) |
| Merthyr Tudful to Leiria | 868.28 mi (1,397.36 km) |
| Merthyr Tudful to Lisbon | 941.51 mi (1,515.22 km) |
| Merthyr Tudful to Loule | 1,033.20 mi (1,662.77 km) |
| Merthyr Tudful to Loures | 934.56 mi (1,504.03 km) |
| Merthyr Tudful to Lourinha | 909.93 mi (1,464.40 km) |
| Merthyr Tudful to Lousa | 836.48 mi (1,346.19 km) |
| Merthyr Tudful to Lousada | 757.23 mi (1,218.64 km) |
| Merthyr Tudful to Macedo de Cavaleiros | 725.00 mi (1,166.77 km) |
| Merthyr Tudful to Mafamude | 774.82 mi (1,246.96 km) |
| Merthyr Tudful to Mafra | 929.80 mi (1,496.37 km) |
| Merthyr Tudful to Maia | 767.22 mi (1,234.72 km) |
