| Merthyr Tudful to Alenquer | 917.98 mi (1,477.35 km) |
| Merthyr Tudful to Alfena | 765.52 mi (1,231.98 km) |
| Merthyr Tudful to Alijo | 748.66 mi (1,204.86 km) |
| Merthyr Tudful to Aljustrel | 983.15 mi (1,582.23 km) |
| Merthyr Tudful to Almada | 944.63 mi (1,520.23 km) |
| Merthyr Tudful to Almargem | 935.13 mi (1,504.95 km) |
| Merthyr Tudful to Almeirim | 902.45 mi (1,452.35 km) |
| Merthyr Tudful to Amadora | 942.17 mi (1,516.28 km) |
| Merthyr Tudful to Amarante | 757.00 mi (1,218.28 km) |
| Merthyr Tudful to Amares | 737.60 mi (1,187.05 km) |
| Merthyr Tudful to Amora | 947.66 mi (1,525.11 km) |
| Merthyr Tudful to Anadia | 817.61 mi (1,315.81 km) |
| Merthyr Tudful to Angra do Heroismo | 1,459.78 mi (2,349.29 km) |
| Merthyr Tudful to Ansiao | 852.07 mi (1,371.27 km) |
| Merthyr Tudful to Anta | 782.28 mi (1,258.96 km) |
