| Niagara Falls to Solofra | 4,548.35 mi (7,319.86 km) |
| Niagara Falls to Somma Lombardo | 4,103.66 mi (6,604.20 km) |
| Niagara Falls to Somma Vesuviana | 4,529.46 mi (7,289.46 km) |
| Niagara Falls to Sommacampagna | 4,201.83 mi (6,762.20 km) |
| Niagara Falls to Sona | 4,199.90 mi (6,759.08 km) |
| Niagara Falls to Sondrio | 4,133.33 mi (6,651.96 km) |
| Niagara Falls to Sora | 4,460.55 mi (7,178.57 km) |
| Niagara Falls to Sorbolo | 4,206.45 mi (6,769.63 km) |
| Niagara Falls to Soresina | 4,165.67 mi (6,704.00 km) |
| Niagara Falls to Sorisole | 4,140.68 mi (6,663.79 km) |
| Niagara Falls to Sorrento | 4,536.94 mi (7,301.51 km) |
| Niagara Falls to Sorso | 4,283.16 mi (6,893.08 km) |
| Niagara Falls to Sortino | 4,710.96 mi (7,581.56 km) |
| Niagara Falls to Soverato Marina | 4,710.68 mi (7,581.10 km) |
| Niagara Falls to Sovicille | 4,298.95 mi (6,918.48 km) |
