| South Portland to Bilecik | 4,818.84 mi (7,755.17 km) |
| South Portland to Bingol | 5,286.70 mi (8,508.12 km) |
| South Portland to Birecik | 5,281.84 mi (8,500.31 km) |
| South Portland to Bitlis | 5,370.85 mi (8,643.55 km) |
| South Portland to Bodrum | 4,853.15 mi (7,810.38 km) |
| South Portland to Bogazliyan | 5,070.99 mi (8,160.97 km) |
| South Portland to Bolu | 4,856.79 mi (7,816.25 km) |
| South Portland to Bolvadin | 4,926.66 mi (7,928.69 km) |
| South Portland to Bor | 5,106.32 mi (8,217.83 km) |
| South Portland to Borcka | 5,206.81 mi (8,379.55 km) |
| South Portland to Boyabat | 4,945.73 mi (7,959.39 km) |
| South Portland to Bozdogan | 4,861.72 mi (7,824.18 km) |
| South Portland to Bozkir | 5,045.67 mi (8,120.21 km) |
| South Portland to Bozkurt | 4,909.24 mi (7,900.66 km) |
| South Portland to Bozuyuk | 4,831.74 mi (7,775.94 km) |
