| Ontario to Superior (Colorado) | 797.51 mi (1,283.47 km) |
| Ontario to Superior (Wisconsin) | 1,591.85 mi (2,561.84 km) |
| Ontario to Surprise (Arizona) | 296.76 mi (477.59 km) |
| Ontario to Susanville (California) | 470.83 mi (757.72 km) |
| Ontario to Sussex (Wisconsin) | 1,695.92 mi (2,729.32 km) |
| Ontario to Suwanee (Georgia) | 1,911.27 mi (3,075.90 km) |
| Ontario to Swansea (Illinois) | 1,563.18 mi (2,515.70 km) |
| Ontario to Sweetwater (Florida) | 2,288.15 mi (3,682.43 km) |
| Ontario to Sweetwater (Texas) | 998.35 mi (1,606.69 km) |
| Ontario to Sycamore (Illinois) | 1,658.17 mi (2,668.57 km) |
| Ontario to Sylacauga (Alabama) | 1,797.67 mi (2,893.07 km) |
| Ontario to Sylvania (Ohio) | 1,909.46 mi (3,072.98 km) |
| Ontario to Syosset (New York) | 2,438.52 mi (3,924.42 km) |
| Ontario to Syracuse (New York) | 2,300.11 mi (3,701.67 km) |
| Ontario to Syracuse (Utah) | 573.28 mi (922.60 km) |
