| Ontario to San Diego (California) | 88.01 mi (141.64 km) |
| Ontario to San Diego Country Estates (California) | 85.37 mi (137.40 km) |
| Ontario to San Dimas (California) | 12.53 mi (20.17 km) |
| Ontario to San Fernando (California) | 50.47 mi (81.22 km) |
| Ontario to San Francisco (California) | 373.09 mi (600.43 km) |
| Ontario to San Gabriel (California) | 28.45 mi (45.79 km) |
| Ontario to San Germán (Puerto Rico) | 3,289.61 mi (5,294.12 km) |
| Ontario to San Jacinto (California) | 39.02 mi (62.80 km) |
| Ontario to San Jose (California) | 327.76 mi (527.49 km) |
| Ontario to San Juan (Puerto Rico) | 3,334.89 mi (5,366.98 km) |
| Ontario to San Juan (Texas) | 1,280.04 mi (2,060.03 km) |
| Ontario to San Juan Capistrano (California) | 37.31 mi (60.04 km) |
| Ontario to San Leandro (California) | 359.38 mi (578.37 km) |
| Ontario to San Lorenzo (California) | 356.70 mi (574.06 km) |
| Ontario to San Luis (Arizona) | 198.64 mi (319.68 km) |
