| Boom to Berga | 632.02 mi (1,017.14 km) |
| Boom to Berja | 1,047.56 mi (1,685.88 km) |
| Boom to Bermeo | 624.65 mi (1,005.28 km) |
| Boom to Berriozar | 636.49 mi (1,024.33 km) |
| Boom to Betanzos | 797.77 mi (1,283.88 km) |
| Boom to Betera | 827.41 mi (1,331.59 km) |
| Boom to Bilbao | 639.35 mi (1,028.94 km) |
| Boom to Binefar | 666.40 mi (1,072.47 km) |
| Boom to Binisalem | 791.14 mi (1,273.21 km) |
| Boom to Blanes | 654.40 mi (1,053.15 km) |
| Boom to Boadilla del Monte | 836.68 mi (1,346.50 km) |
| Boom to Boiro | 853.35 mi (1,373.34 km) |
| Boom to Bolanos de Calatrava | 929.59 mi (1,496.03 km) |
| Boom to Bollullos de la Mitacion | 1,080.57 mi (1,739.01 km) |
| Boom to Bollullos par del Condado | 1,089.95 mi (1,754.11 km) |
