| Merthyr Tudful to Bougival | 314.22 mi (505.69 km) |
| Merthyr Tudful to Bouguenais | 325.13 mi (523.25 km) |
| Merthyr Tudful to Boulogne-Billancourt | 319.05 mi (513.46 km) |
| Merthyr Tudful to Boulogne-sur-Mer | 227.07 mi (365.44 km) |
| Merthyr Tudful to Bourg-de-Peage | 602.65 mi (969.88 km) |
| Merthyr Tudful to Bourg-en-Bresse | 545.89 mi (878.53 km) |
| Merthyr Tudful to Bourg-la-Reine | 324.12 mi (521.62 km) |
| Merthyr Tudful to Bourg-les-Valence | 603.20 mi (970.75 km) |
| Merthyr Tudful to Bourges | 413.23 mi (665.03 km) |
| Merthyr Tudful to Bourgoin-Jallieu | 579.60 mi (932.78 km) |
| Merthyr Tudful to Bressuire | 362.85 mi (583.95 km) |
| Merthyr Tudful to Brest | 236.85 mi (381.18 km) |
| Merthyr Tudful to Bretigny-sur-Orge | 331.60 mi (533.65 km) |
| Merthyr Tudful to Breuillet | 329.28 mi (529.92 km) |
| Merthyr Tudful to Briancon | 658.76 mi (1,060.17 km) |
