| Ontario to Storm Lake (Iowa) | 1,346.49 mi (2,166.96 km) |
| Ontario to Storrs (Connecticut) | 2,499.59 mi (4,022.69 km) |
| Ontario to Stoughton (Wisconsin) | 1,643.49 mi (2,644.94 km) |
| Ontario to Stow (Ohio) | 2,024.75 mi (3,258.53 km) |
| Ontario to Streamwood (Illinois) | 1,683.99 mi (2,710.12 km) |
| Ontario to Streator (Illinois) | 1,641.32 mi (2,641.45 km) |
| Ontario to Streetsboro (Ohio) | 2,029.54 mi (3,266.23 km) |
| Ontario to Strongsville (Ohio) | 2,004.57 mi (3,226.04 km) |
| Ontario to Stuart (Florida) | 2,258.36 mi (3,634.47 km) |
| Ontario to Stuarts Draft (Virginia) | 2,157.22 mi (3,471.71 km) |
| Ontario to Sturgis (Michigan) | 1,822.41 mi (2,932.88 km) |
| Ontario to Suamico (Wisconsin) | 1,727.33 mi (2,779.87 km) |
| Ontario to Sudley (Virginia) | 2,236.22 mi (3,598.85 km) |
| Ontario to Suffern (New York) | 2,404.07 mi (3,868.98 km) |
| Ontario to Suffolk (Virginia) | 2,297.97 mi (3,698.23 km) |
