| Ontario to Somersworth (New Hampshire) | 2,565.10 mi (4,128.14 km) |
| Ontario to Somerton (Arizona) | 195.05 mi (313.90 km) |
| Ontario to Somerville (Massachusetts) | 2,556.52 mi (4,114.32 km) |
| Ontario to Somerville (New Jersey) | 2,381.59 mi (3,832.80 km) |
| Ontario to Sonoma (California) | 399.32 mi (642.64 km) |
| Ontario to Soquel (California) | 318.38 mi (512.38 km) |
| Ontario to South Bend (Indiana) | 1,777.84 mi (2,861.15 km) |
| Ontario to South Bradenton (Florida) | 2,117.97 mi (3,408.54 km) |
| Ontario to South Burlington (Vermont) | 2,448.61 mi (3,940.65 km) |
| Ontario to South Charleston (West Virginia) | 2,010.53 mi (3,235.64 km) |
| Ontario to South Daytona (Florida) | 2,168.41 mi (3,489.72 km) |
| Ontario to South El Monte (California) | 25.31 mi (40.74 km) |
| Ontario to South Elgin (Illinois) | 1,676.78 mi (2,698.51 km) |
| Ontario to South Euclid (Ohio) | 2,021.17 mi (3,252.75 km) |
| Ontario to South Farmingdale (New York) | 2,441.79 mi (3,929.69 km) |
