| Ontario to Southern Pines (North Carolina) | 2,160.30 mi (3,476.67 km) |
| Ontario to Southfield (Michigan) | 1,937.40 mi (3,117.95 km) |
| Ontario to Southgate (Michigan) | 1,938.31 mi (3,119.41 km) |
| Ontario to Southlake (Texas) | 1,179.06 mi (1,897.51 km) |
| Ontario to Spanaway (Washington) | 936.53 mi (1,507.20 km) |
| Ontario to Spanish Fork (Utah) | 532.72 mi (857.33 km) |
| Ontario to Spanish Lake (Missouri) | 1,552.18 mi (2,498.00 km) |
| Ontario to Spanish Springs (Nevada) | 404.51 mi (651.00 km) |
| Ontario to Sparks (Nevada) | 399.76 mi (643.35 km) |
| Ontario to Spartanburg (South Carolina) | 2,022.07 mi (3,254.21 km) |
| Ontario to Spearfish (South Dakota) | 1,029.62 mi (1,657.02 km) |
| Ontario to Speedway (Indiana) | 1,767.64 mi (2,844.74 km) |
| Ontario to Spencer (Iowa) | 1,360.07 mi (2,188.83 km) |
| Ontario to Spokane (Washington) | 941.63 mi (1,515.41 km) |
| Ontario to Spokane Valley (Washington) | 941.48 mi (1,515.16 km) |
