| Ontario to San Luis Obispo (California) | 193.62 mi (311.60 km) |
| Ontario to San Marcos (California) | 67.25 mi (108.23 km) |
| Ontario to San Marcos (Texas) | 1,186.44 mi (1,909.39 km) |
| Ontario to San Marino (California) | 29.57 mi (47.58 km) |
| Ontario to San Mateo (California) | 358.31 mi (576.65 km) |
| Ontario to San Pablo (California) | 378.81 mi (609.63 km) |
| Ontario to San Rafael (California) | 387.18 mi (623.11 km) |
| Ontario to San Ramon (California) | 353.33 mi (568.63 km) |
| Ontario to San Tan Valley (Arizona) | 352.75 mi (567.70 km) |
| Ontario to Sand Springs (Oklahoma) | 1,220.40 mi (1,964.05 km) |
| Ontario to Sandusky (Ohio) | 1,959.99 mi (3,154.30 km) |
| Ontario to Sandy (Oregon) | 822.68 mi (1,323.98 km) |
| Ontario to Sandy (Utah) | 550.82 mi (886.45 km) |
| Ontario to Sandy Springs (Georgia) | 1,895.55 mi (3,050.59 km) |
| Ontario to Sanford (Florida) | 2,161.29 mi (3,478.26 km) |
