| Boulder to Sesimbra | 4,863.66 mi (7,827.30 km) |
| Boulder to Setubal | 4,869.42 mi (7,836.57 km) |
| Boulder to Sever do Vouga | 4,802.47 mi (7,728.83 km) |
| Boulder to Silves | 4,944.22 mi (7,956.95 km) |
| Boulder to Sines | 4,893.92 mi (7,876.00 km) |
| Boulder to Sintra | 4,836.62 mi (7,783.78 km) |
| Boulder to Sobrado de Paiva | 4,794.61 mi (7,716.17 km) |
| Boulder to Sobral de Monte Agraco | 4,838.06 mi (7,786.10 km) |
| Boulder to Soure | 4,818.69 mi (7,754.94 km) |
| Boulder to Tabua | 4,831.93 mi (7,776.24 km) |
| Boulder to Tavira | 4,981.87 mi (8,017.54 km) |
| Boulder to Tomar | 4,846.25 mi (7,799.28 km) |
| Boulder to Tondela | 4,823.28 mi (7,762.32 km) |
| Boulder to Torre de Moncorvo | 4,835.60 mi (7,782.14 km) |
| Boulder to Torres Novas | 4,846.65 mi (7,799.92 km) |
