| Ontario to Bonham (Texas) | 1,227.58 mi (1,975.60 km) |
| Ontario to Bonita (California) | 100.61 mi (161.92 km) |
| Ontario to Bonita Springs (Florida) | 2,192.02 mi (3,527.71 km) |
| Ontario to Bonney Lake (Washington) | 938.46 mi (1,510.31 km) |
| Ontario to Boone (Iowa) | 1,398.87 mi (2,251.26 km) |
| Ontario to Boone (North Carolina) | 2,024.95 mi (3,258.84 km) |
| Ontario to Borger (Texas) | 924.59 mi (1,487.98 km) |
| Ontario to Bossier City (Louisiana) | 1,383.60 mi (2,226.69 km) |
| Ontario to Boston (Massachusetts) | 2,557.59 mi (4,116.04 km) |
| Ontario to Bostonia (California) | 92.47 mi (148.82 km) |
| Ontario to Bothell (Washington) | 978.38 mi (1,574.55 km) |
| Ontario to Bothell East (Washington) | 980.32 mi (1,577.67 km) |
| Ontario to Bothell West (Washington) | 980.96 mi (1,578.71 km) |
| Ontario to Boulder (Colorado) | 795.96 mi (1,280.97 km) |
| Ontario to Boulder City (Nevada) | 196.31 mi (315.93 km) |
