| Ontario to Buena Park (California) | 26.06 mi (41.94 km) |
| Ontario to Buenaventura Lakes (Florida) | 2,167.21 mi (3,487.79 km) |
| Ontario to Buffalo (Minnesota) | 1,471.34 mi (2,367.89 km) |
| Ontario to Buffalo (New York) | 2,163.08 mi (3,481.14 km) |
| Ontario to Buffalo Grove (Illinois) | 1,696.59 mi (2,730.41 km) |
| Ontario to Buford (Georgia) | 1,914.91 mi (3,081.75 km) |
| Ontario to Bull Run (Virginia) | 2,234.95 mi (3,596.81 km) |
| Ontario to Bullhead City (Arizona) | 189.43 mi (304.86 km) |
| Ontario to Burbank (California) | 42.29 mi (68.05 km) |
| Ontario to Burbank (Illinois) | 1,701.84 mi (2,738.84 km) |
| Ontario to Burien (Washington) | 960.40 mi (1,545.61 km) |
| Ontario to Burkburnett (Texas) | 1,088.27 mi (1,751.40 km) |
| Ontario to Burke (Virginia) | 2,248.78 mi (3,619.06 km) |
| Ontario to Burke Centre (Virginia) | 2,246.75 mi (3,615.79 km) |
| Ontario to Burleson (Texas) | 1,173.76 mi (1,888.99 km) |
