| Houston to Santarem | 4,790.75 mi (7,709.96 km) |
| Houston to Santiago do Cacem | 4,822.08 mi (7,760.39 km) |
| Houston to Santo Andre | 4,818.69 mi (7,754.93 km) |
| Houston to Santo Tirso | 4,747.46 mi (7,640.30 km) |
| Houston to Sao Bras de Alportel | 4,886.60 mi (7,864.23 km) |
| Houston to Sao Felix da Marinha | 4,747.50 mi (7,640.36 km) |
| Houston to Sao Joao da Madeira | 4,757.49 mi (7,656.44 km) |
| Houston to Sao Joao de Ver | 4,753.03 mi (7,649.26 km) |
| Houston to Sao Mamede de Infesta | 4,744.40 mi (7,635.37 km) |
| Houston to Sao Pedro do Sul | 4,781.76 mi (7,695.50 km) |
| Houston to Satao | 4,798.37 mi (7,722.23 km) |
| Houston to Seia | 4,808.01 mi (7,737.74 km) |
| Houston to Senhora da Hora | 4,742.29 mi (7,631.98 km) |
| Houston to Serpa | 4,879.26 mi (7,852.42 km) |
| Houston to Serta | 4,804.87 mi (7,732.68 km) |
