| South Portland to Barking | 3,195.38 mi (5,142.46 km) |
| South Portland to Barnet | 3,181.67 mi (5,120.40 km) |
| South Portland to Barnoldswick | 3,055.49 mi (4,917.34 km) |
| South Portland to Barnsley | 3,090.27 mi (4,973.31 km) |
| South Portland to Barnstaple | 3,035.60 mi (4,885.33 km) |
| South Portland to Barrhead | 2,939.16 mi (4,730.12 km) |
| South Portland to Barri | 3,061.50 mi (4,927.01 km) |
| South Portland to Barrow in Furness | 3,011.32 mi (4,846.26 km) |
| South Portland to Barton upon Humber | 3,128.11 mi (5,034.20 km) |
| South Portland to Barton upon Irwell | 3,057.04 mi (4,919.84 km) |
| South Portland to Barwell | 3,115.46 mi (5,013.84 km) |
| South Portland to Basford | 3,114.08 mi (5,011.63 km) |
| South Portland to Basildon | 3,211.07 mi (5,167.72 km) |
| South Portland to Basingstoke | 3,153.99 mi (5,075.86 km) |
| South Portland to Bath | 3,099.40 mi (4,988.00 km) |
