| Siena to Bougival | 583.10 mi (938.42 km) |
| Siena to Bouguenais | 683.11 mi (1,099.36 km) |
| Siena to Boulogne-Billancourt | 578.19 mi (930.51 km) |
| Siena to Boulogne-sur-Mer | 685.48 mi (1,103.18 km) |
| Siena to Bourg-de-Peage | 333.05 mi (535.99 km) |
| Siena to Bourg-en-Bresse | 359.60 mi (578.72 km) |
| Siena to Bourg-la-Reine | 573.17 mi (922.43 km) |
| Siena to Bourg-les-Valence | 338.32 mi (544.47 km) |
| Siena to Bourges | 506.42 mi (815.01 km) |
| Siena to Bourgoin-Jallieu | 337.24 mi (542.74 km) |
| Siena to Bressuire | 625.11 mi (1,006.01 km) |
| Siena to Brest | 836.06 mi (1,345.50 km) |
| Siena to Bretigny-sur-Orge | 566.46 mi (911.63 km) |
| Siena to Breuillet | 569.54 mi (916.59 km) |
| Siena to Briancon | 257.18 mi (413.88 km) |
