| Merthyr Tudful to Barberino di Mugello | 860.48 mi (1,384.82 km) |
| Merthyr Tudful to Barcellona-Pozzo di Gotto | 1,299.91 mi (2,092.01 km) |
| Merthyr Tudful to Bareggio | 710.46 mi (1,143.38 km) |
| Merthyr Tudful to Barga | 829.91 mi (1,335.60 km) |
| Merthyr Tudful to Bari | 1,204.55 mi (1,938.53 km) |
| Merthyr Tudful to Barletta | 1,173.64 mi (1,888.79 km) |
| Merthyr Tudful to Baronissi | 1,147.25 mi (1,846.32 km) |
| Merthyr Tudful to Barrafranca | 1,310.47 mi (2,109.00 km) |
| Merthyr Tudful to Bassano del Grappa | 800.45 mi (1,288.21 km) |
| Merthyr Tudful to Battipaglia | 1,161.37 mi (1,869.05 km) |
| Merthyr Tudful to Beinasco | 683.51 mi (1,100.01 km) |
| Merthyr Tudful to Bellinzago Novarese | 692.50 mi (1,114.47 km) |
| Merthyr Tudful to Belluno | 804.36 mi (1,294.49 km) |
| Merthyr Tudful to Belmonte Mezzagno | 1,246.16 mi (2,005.51 km) |
| Merthyr Tudful to Belpasso | 1,323.46 mi (2,129.90 km) |
