| Boulogne-sur-Mer to Azcoitia | 553.14 mi (890.20 km) |
| Boulogne-sur-Mer to Azpeitia | 552.26 mi (888.77 km) |
| Boulogne-sur-Mer to Azuqueca de Henares | 740.24 mi (1,191.30 km) |
| Boulogne-sur-Mer to Badajoz | 919.01 mi (1,479.01 km) |
| Boulogne-sur-Mer to Badalona | 642.77 mi (1,034.44 km) |
| Boulogne-sur-Mer to Baena | 951.51 mi (1,531.31 km) |
| Boulogne-sur-Mer to Baeza | 914.99 mi (1,472.53 km) |
| Boulogne-sur-Mer to Bailen | 912.42 mi (1,468.40 km) |
| Boulogne-sur-Mer to Balaguer | 618.62 mi (995.57 km) |
| Boulogne-sur-Mer to Banolas | 597.19 mi (961.08 km) |
| Boulogne-sur-Mer to Baranain | 569.11 mi (915.89 km) |
| Boulogne-sur-Mer to Barbadanes | 736.24 mi (1,184.86 km) |
| Boulogne-sur-Mer to Barbastro | 604.58 mi (972.98 km) |
| Boulogne-sur-Mer to Barcelona | 646.16 mi (1,039.89 km) |
| Boulogne-sur-Mer to Bargas | 793.33 mi (1,276.75 km) |
