| Idrija to Berga | 661.40 mi (1,064.42 km) |
| Idrija to Berja | 1,079.68 mi (1,737.57 km) |
| Idrija to Bermeo | 840.09 mi (1,351.99 km) |
| Idrija to Berriozar | 803.51 mi (1,293.12 km) |
| Idrija to Betanzos | 1,105.58 mi (1,779.25 km) |
| Idrija to Betera | 855.85 mi (1,377.36 km) |
| Idrija to Bilbao | 853.05 mi (1,372.84 km) |
| Idrija to Binefar | 739.68 mi (1,190.40 km) |
| Idrija to Binisalem | 714.57 mi (1,149.99 km) |
| Idrija to Blanes | 633.98 mi (1,020.29 km) |
| Idrija to Boadilla del Monte | 978.23 mi (1,574.31 km) |
| Idrija to Boiro | 1,152.42 mi (1,854.65 km) |
| Idrija to Bolanos de Calatrava | 1,026.56 mi (1,652.08 km) |
| Idrija to Bollullos de la Mitacion | 1,195.67 mi (1,924.24 km) |
| Idrija to Bollullos par del Condado | 1,213.43 mi (1,952.83 km) |
