| Merthyr Tudful to Arcos de Valdevez | 723.67 mi (1,164.63 km) |
| Merthyr Tudful to Arcozelo | 779.31 mi (1,254.18 km) |
| Merthyr Tudful to Arganil | 826.90 mi (1,330.77 km) |
| Merthyr Tudful to Arouca | 781.64 mi (1,257.94 km) |
| Merthyr Tudful to Arruda dos Vinhos | 923.14 mi (1,485.64 km) |
| Merthyr Tudful to Aveiro | 807.43 mi (1,299.43 km) |
| Merthyr Tudful to Aver-o-Mar | 758.34 mi (1,220.43 km) |
| Merthyr Tudful to Aves | 748.81 mi (1,205.09 km) |
| Merthyr Tudful to Azambuja | 914.76 mi (1,472.17 km) |
| Merthyr Tudful to Baiao | 763.21 mi (1,228.26 km) |
| Merthyr Tudful to Barcelos | 748.52 mi (1,204.63 km) |
| Merthyr Tudful to Barreiro | 944.24 mi (1,519.61 km) |
| Merthyr Tudful to Batalha | 874.94 mi (1,408.08 km) |
| Merthyr Tudful to Beja | 972.10 mi (1,564.44 km) |
| Merthyr Tudful to Belas | 939.93 mi (1,512.67 km) |
