| Duncan to Bilecik | 6,302.61 mi (10,143.08 km) |
| Duncan to Bingol | 6,709.37 mi (10,797.68 km) |
| Duncan to Birecik | 6,737.82 mi (10,843.47 km) |
| Duncan to Bitlis | 6,784.63 mi (10,918.81 km) |
| Duncan to Bodrum | 6,372.28 mi (10,255.19 km) |
| Duncan to Bogazliyan | 6,529.25 mi (10,507.82 km) |
| Duncan to Bolu | 6,326.36 mi (10,181.28 km) |
| Duncan to Bolvadin | 6,414.77 mi (10,323.57 km) |
| Duncan to Bor | 6,578.99 mi (10,587.85 km) |
| Duncan to Borcka | 6,599.51 mi (10,620.88 km) |
| Duncan to Boyabat | 6,389.06 mi (10,282.20 km) |
| Duncan to Bozdogan | 6,372.20 mi (10,255.06 km) |
| Duncan to Bozkir | 6,537.66 mi (10,521.35 km) |
| Duncan to Bozkurt | 6,411.79 mi (10,318.79 km) |
| Duncan to Bozuyuk | 6,316.95 mi (10,166.14 km) |
