| Idrija to Bougival | 589.01 mi (947.93 km) |
| Idrija to Bouguenais | 746.19 mi (1,200.88 km) |
| Idrija to Boulogne-Billancourt | 584.02 mi (939.89 km) |
| Idrija to Boulogne-sur-Mer | 655.45 mi (1,054.85 km) |
| Idrija to Bourg-de-Peage | 439.44 mi (707.22 km) |
| Idrija to Bourg-en-Bresse | 421.52 mi (678.37 km) |
| Idrija to Bourg-la-Reine | 579.77 mi (933.04 km) |
| Idrija to Bourg-les-Valence | 448.16 mi (721.24 km) |
| Idrija to Bourges | 557.24 mi (896.79 km) |
| Idrija to Bourgoin-Jallieu | 422.48 mi (679.92 km) |
| Idrija to Bressuire | 692.82 mi (1,114.98 km) |
| Idrija to Brest | 882.59 mi (1,420.39 km) |
| Idrija to Bretigny-sur-Orge | 577.29 mi (929.06 km) |
| Idrija to Breuillet | 582.53 mi (937.50 km) |
| Idrija to Briancon | 366.25 mi (589.42 km) |
