| Watford to Bilecik | 1,646.13 mi (2,649.19 km) |
| Watford to Bingol | 2,140.24 mi (3,444.38 km) |
| Watford to Birecik | 2,115.47 mi (3,404.52 km) |
| Watford to Bitlis | 2,229.20 mi (3,587.55 km) |
| Watford to Bodrum | 1,688.64 mi (2,717.60 km) |
| Watford to Bogazliyan | 1,905.55 mi (3,066.68 km) |
| Watford to Bolu | 1,688.16 mi (2,716.83 km) |
| Watford to Bolvadin | 1,753.27 mi (2,821.61 km) |
| Watford to Bor | 1,935.16 mi (3,114.33 km) |
| Watford to Borcka | 2,089.52 mi (3,362.76 km) |
| Watford to Boyabat | 1,791.17 mi (2,882.61 km) |
| Watford to Bozdogan | 1,692.24 mi (2,723.39 km) |
| Watford to Bozkir | 1,872.22 mi (3,013.05 km) |
| Watford to Bozkurt | 1,737.11 mi (2,795.61 km) |
| Watford to Bozuyuk | 1,658.77 mi (2,669.54 km) |
