| Houston to Sesimbra | 4,790.78 mi (7,710.02 km) |
| Houston to Setubal | 4,799.03 mi (7,723.29 km) |
| Houston to Sever do Vouga | 4,767.62 mi (7,672.74 km) |
| Houston to Silves | 4,857.47 mi (7,817.35 km) |
| Houston to Sines | 4,815.46 mi (7,749.73 km) |
| Houston to Sintra | 4,767.10 mi (7,671.91 km) |
| Houston to Sobrado de Paiva | 4,764.77 mi (7,668.16 km) |
| Houston to Sobral de Monte Agraco | 4,773.22 mi (7,681.76 km) |
| Houston to Soure | 4,772.19 mi (7,680.09 km) |
| Houston to Tabua | 4,793.70 mi (7,714.71 km) |
| Houston to Tavira | 4,899.31 mi (7,884.68 km) |
| Houston to Tomar | 4,794.51 mi (7,716.02 km) |
| Houston to Tondela | 4,787.00 mi (7,703.93 km) |
| Houston to Torre de Moncorvo | 4,815.13 mi (7,749.21 km) |
| Houston to Torres Novas | 4,792.24 mi (7,712.36 km) |
