| Caerfyrddin to Bougival | 351.46 mi (565.62 km) |
| Caerfyrddin to Bouguenais | 345.05 mi (555.30 km) |
| Caerfyrddin to Boulogne-Billancourt | 356.35 mi (573.50 km) |
| Caerfyrddin to Boulogne-sur-Mer | 267.79 mi (430.96 km) |
| Caerfyrddin to Bourg-de-Peage | 636.32 mi (1,024.06 km) |
| Caerfyrddin to Bourg-en-Bresse | 581.71 mi (936.16 km) |
| Caerfyrddin to Bourg-la-Reine | 361.39 mi (581.60 km) |
| Caerfyrddin to Bourg-les-Valence | 636.49 mi (1,024.34 km) |
| Caerfyrddin to Bourges | 446.32 mi (718.28 km) |
| Caerfyrddin to Bourgoin-Jallieu | 614.46 mi (988.87 km) |
| Caerfyrddin to Bressuire | 386.90 mi (622.65 km) |
| Caerfyrddin to Brest | 239.60 mi (385.60 km) |
| Caerfyrddin to Bretigny-sur-Orge | 368.41 mi (592.91 km) |
| Caerfyrddin to Breuillet | 365.76 mi (588.64 km) |
| Caerfyrddin to Briancon | 694.22 mi (1,117.24 km) |
