| Watford to Barberino di Mugello | 753.89 mi (1,213.27 km) |
| Watford to Barcellona-Pozzo di Gotto | 1,200.78 mi (1,932.47 km) |
| Watford to Bareggio | 604.69 mi (973.16 km) |
| Watford to Barga | 725.51 mi (1,167.59 km) |
| Watford to Bari | 1,093.24 mi (1,759.41 km) |
| Watford to Barletta | 1,063.05 mi (1,710.82 km) |
| Watford to Baronissi | 1,041.99 mi (1,676.92 km) |
| Watford to Barrafranca | 1,216.52 mi (1,957.81 km) |
| Watford to Bassano del Grappa | 685.12 mi (1,102.60 km) |
| Watford to Battipaglia | 1,055.94 mi (1,699.37 km) |
| Watford to Beinasco | 586.38 mi (943.68 km) |
| Watford to Bellinzago Novarese | 587.44 mi (945.40 km) |
| Watford to Belluno | 686.57 mi (1,104.92 km) |
| Watford to Belmonte Mezzagno | 1,153.05 mi (1,855.66 km) |
| Watford to Belpasso | 1,226.51 mi (1,973.88 km) |
