| Niagara Falls to Santarem | 3,558.35 mi (5,726.61 km) |
| Niagara Falls to Santiago do Cacem | 3,598.39 mi (5,791.05 km) |
| Niagara Falls to Santo Andre | 3,594.89 mi (5,785.42 km) |
| Niagara Falls to Santo Tirso | 3,500.89 mi (5,634.14 km) |
| Niagara Falls to Sao Bras de Alportel | 3,666.94 mi (5,901.37 km) |
| Niagara Falls to Sao Felix da Marinha | 3,503.11 mi (5,637.71 km) |
| Niagara Falls to Sao Joao da Madeira | 3,513.66 mi (5,654.70 km) |
| Niagara Falls to Sao Joao de Ver | 3,508.98 mi (5,647.16 km) |
| Niagara Falls to Sao Mamede de Infesta | 3,498.93 mi (5,630.98 km) |
| Niagara Falls to Sao Pedro do Sul | 3,537.94 mi (5,693.76 km) |
| Niagara Falls to Satao | 3,553.92 mi (5,719.49 km) |
| Niagara Falls to Seia | 3,565.43 mi (5,738.00 km) |
| Niagara Falls to Senhora da Hora | 3,497.01 mi (5,627.90 km) |
| Niagara Falls to Serpa | 3,653.01 mi (5,878.95 km) |
| Niagara Falls to Serta | 3,567.21 mi (5,740.86 km) |
