| South Portland to Bicaz | 4,375.20 mi (7,041.20 km) |
| South Portland to Bistrita | 4,305.49 mi (6,929.02 km) |
| South Portland to Blaj | 4,321.33 mi (6,954.51 km) |
| South Portland to Bocsa | 4,266.39 mi (6,866.09 km) |
| South Portland to Boldesti-Scaeni | 4,450.59 mi (7,162.54 km) |
| South Portland to Bolintin Vale | 4,464.23 mi (7,184.49 km) |
| South Portland to Borsa | 4,290.82 mi (6,905.41 km) |
| South Portland to Botosani | 4,362.68 mi (7,021.05 km) |
| South Portland to Brad | 4,279.23 mi (6,886.76 km) |
| South Portland to Bragadiru | 4,475.99 mi (7,203.40 km) |
| South Portland to Braila | 4,515.00 mi (7,266.19 km) |
| South Portland to Brasov | 4,408.14 mi (7,094.22 km) |
| South Portland to Breaza | 4,429.73 mi (7,128.97 km) |
| South Portland to Bucharest | 4,478.46 mi (7,207.38 km) |
| South Portland to Buftea | 4,466.67 mi (7,188.41 km) |
