| Southborough to Ayamonte | 1,035.24 mi (1,666.06 km) |
| Southborough to Azcoitia | 564.43 mi (908.36 km) |
| Southborough to Azpeitia | 563.80 mi (907.34 km) |
| Southborough to Azuqueca de Henares | 751.30 mi (1,209.10 km) |
| Southborough to Badajoz | 918.08 mi (1,477.51 km) |
| Southborough to Badalona | 678.50 mi (1,091.95 km) |
| Southborough to Baena | 962.21 mi (1,548.53 km) |
| Southborough to Baeza | 928.44 mi (1,494.17 km) |
| Southborough to Bailen | 924.63 mi (1,488.05 km) |
| Southborough to Balaguer | 647.87 mi (1,042.64 km) |
| Southborough to Banolas | 635.70 mi (1,023.06 km) |
| Southborough to Baranain | 584.68 mi (940.96 km) |
| Southborough to Barbadanes | 723.21 mi (1,163.89 km) |
| Southborough to Barbastro | 630.42 mi (1,014.56 km) |
| Southborough to Barcelona | 681.62 mi (1,096.97 km) |
