| Portsmouth to Bilecik | 1,659.22 mi (2,670.26 km) |
| Portsmouth to Bingol | 2,162.75 mi (3,480.62 km) |
| Portsmouth to Birecik | 2,132.23 mi (3,431.50 km) |
| Portsmouth to Bitlis | 2,252.48 mi (3,625.01 km) |
| Portsmouth to Bodrum | 1,691.57 mi (2,722.31 km) |
| Portsmouth to Bogazliyan | 1,923.09 mi (3,094.91 km) |
| Portsmouth to Bolu | 1,704.58 mi (2,743.25 km) |
| Portsmouth to Bolvadin | 1,764.76 mi (2,840.10 km) |
| Portsmouth to Bor | 1,949.47 mi (3,137.37 km) |
| Portsmouth to Borcka | 2,117.31 mi (3,407.48 km) |
| Portsmouth to Boyabat | 1,812.66 mi (2,917.20 km) |
| Portsmouth to Bozdogan | 1,697.78 mi (2,732.31 km) |
| Portsmouth to Bozkir | 1,882.33 mi (3,029.32 km) |
| Portsmouth to Bozkurt | 1,744.84 mi (2,808.05 km) |
| Portsmouth to Bozuyuk | 1,671.43 mi (2,689.90 km) |
