| Merthyr Tudful to Ayamonte | 1,023.80 mi (1,647.64 km) |
| Merthyr Tudful to Azcoitia | 593.78 mi (955.60 km) |
| Merthyr Tudful to Azpeitia | 593.77 mi (955.59 km) |
| Merthyr Tudful to Azuqueca de Henares | 772.36 mi (1,243.00 km) |
| Merthyr Tudful to Badajoz | 905.46 mi (1,457.20 km) |
| Merthyr Tudful to Badalona | 759.96 mi (1,223.04 km) |
| Merthyr Tudful to Baena | 977.10 mi (1,572.49 km) |
| Merthyr Tudful to Baeza | 950.71 mi (1,530.02 km) |
| Merthyr Tudful to Bailen | 943.98 mi (1,519.19 km) |
| Merthyr Tudful to Balaguer | 715.29 mi (1,151.14 km) |
| Merthyr Tudful to Banolas | 724.74 mi (1,166.36 km) |
| Merthyr Tudful to Baranain | 623.04 mi (1,002.69 km) |
| Merthyr Tudful to Barbadanes | 686.07 mi (1,104.12 km) |
| Merthyr Tudful to Barbastro | 690.58 mi (1,111.38 km) |
| Merthyr Tudful to Barcelona | 762.37 mi (1,226.92 km) |
