| Boulogne-sur-Mer to Bormujos | 997.47 mi (1,605.28 km) |
| Boulogne-sur-Mer to Brenes | 981.85 mi (1,580.13 km) |
| Boulogne-sur-Mer to Brunete | 762.76 mi (1,227.55 km) |
| Boulogne-sur-Mer to Bueu | 761.41 mi (1,225.36 km) |
| Boulogne-sur-Mer to Bullas | 890.53 mi (1,433.17 km) |
| Boulogne-sur-Mer to Bunol | 789.89 mi (1,271.21 km) |
| Boulogne-sur-Mer to Burela de Cabo | 645.76 mi (1,039.25 km) |
| Boulogne-sur-Mer to Burgos | 631.65 mi (1,016.54 km) |
| Boulogne-sur-Mer to Burjasot | 781.39 mi (1,257.52 km) |
| Boulogne-sur-Mer to Burriana | 753.29 mi (1,212.30 km) |
| Boulogne-sur-Mer to Cabanaquinta | 626.29 mi (1,007.92 km) |
| Boulogne-sur-Mer to Cabanillas del Campo | 734.88 mi (1,182.67 km) |
| Boulogne-sur-Mer to Cabra | 963.24 mi (1,550.18 km) |
| Boulogne-sur-Mer to Caceres | 867.68 mi (1,396.40 km) |
| Boulogne-sur-Mer to Cadiz | 1,055.89 mi (1,699.29 km) |
