| Ontario to Ayamonte | 5,780.26 mi (9,302.44 km) |
| Ontario to Azcoitia | 5,722.91 mi (9,210.13 km) |
| Ontario to Azpeitia | 5,724.51 mi (9,212.71 km) |
| Ontario to Azuqueca de Henares | 5,803.62 mi (9,340.03 km) |
| Ontario to Badajoz | 5,725.97 mi (9,215.06 km) |
| Ontario to Badalona | 5,975.59 mi (9,616.79 km) |
| Ontario to Baena | 5,892.85 mi (9,483.62 km) |
| Ontario to Baeza | 5,911.74 mi (9,514.02 km) |
| Ontario to Bailen | 5,894.84 mi (9,486.83 km) |
| Ontario to Balaguer | 5,905.10 mi (9,503.34 km) |
| Ontario to Banolas | 5,962.34 mi (9,595.46 km) |
| Ontario to Baranain | 5,764.65 mi (9,277.31 km) |
| Ontario to Barbadanes | 5,541.62 mi (8,918.38 km) |
| Ontario to Barbastro | 5,867.94 mi (9,443.54 km) |
| Ontario to Barcelona | 5,975.92 mi (9,617.31 km) |
