| Boston to Ayamonte | 1,146.30 mi (1,844.79 km) |
| Boston to Azcoitia | 684.86 mi (1,102.18 km) |
| Boston to Azpeitia | 684.36 mi (1,101.37 km) |
| Boston to Azuqueca de Henares | 870.82 mi (1,401.45 km) |
| Boston to Badajoz | 1,028.34 mi (1,654.96 km) |
| Boston to Badalona | 804.27 mi (1,294.35 km) |
| Boston to Baena | 1,080.93 mi (1,739.59 km) |
| Boston to Baeza | 1,048.81 mi (1,687.89 km) |
| Boston to Bailen | 1,044.33 mi (1,680.68 km) |
| Boston to Balaguer | 773.67 mi (1,245.09 km) |
| Boston to Banolas | 761.01 mi (1,224.73 km) |
| Boston to Baranain | 707.03 mi (1,137.85 km) |
| Boston to Barbadanes | 822.63 mi (1,323.90 km) |
| Boston to Barbastro | 755.77 mi (1,216.29 km) |
| Boston to Barcelona | 807.42 mi (1,299.42 km) |
