| Merthyr Tudful to Bispham | 146.40 mi (235.60 km) |
| Merthyr Tudful to Blackburn | 143.51 mi (230.95 km) |
| Merthyr Tudful to Blackpool | 143.76 mi (231.36 km) |
| Merthyr Tudful to Blairgowrie | 335.01 mi (539.15 km) |
| Merthyr Tudful to Blandford Forum | 80.63 mi (129.77 km) |
| Merthyr Tudful to Blaydon | 232.75 mi (374.57 km) |
| Merthyr Tudful to Bletchley | 114.20 mi (183.79 km) |
| Merthyr Tudful to Bloxwich | 83.73 mi (134.74 km) |
| Merthyr Tudful to Blunsdon Saint Andrew | 68.65 mi (110.49 km) |
| Merthyr Tudful to Blyth | 245.99 mi (395.88 km) |
| Merthyr Tudful to Bo'ness | 295.44 mi (475.47 km) |
| Merthyr Tudful to Bodmin | 105.66 mi (170.04 km) |
| Merthyr Tudful to Bognor Regis | 134.33 mi (216.19 km) |
| Merthyr Tudful to Bolsover | 135.26 mi (217.68 km) |
| Merthyr Tudful to Bolton | 132.87 mi (213.84 km) |
