| Slough to Sesimbra | 992.34 mi (1,597.02 km) |
| Slough to Setubal | 983.04 mi (1,582.05 km) |
| Slough to Sever do Vouga | 831.38 mi (1,337.97 km) |
| Slough to Silves | 1,061.35 mi (1,708.08 km) |
| Slough to Sines | 1,019.22 mi (1,640.28 km) |
| Slough to Sintra | 975.56 mi (1,570.02 km) |
| Slough to Sobrado de Paiva | 810.32 mi (1,304.08 km) |
| Slough to Sobral de Monte Agraco | 956.70 mi (1,539.65 km) |
| Slough to Soure | 880.26 mi (1,416.64 km) |
| Slough to Tabua | 848.15 mi (1,364.97 km) |
| Slough to Tavira | 1,052.67 mi (1,694.10 km) |
| Slough to Tomar | 904.54 mi (1,455.72 km) |
| Slough to Tondela | 839.26 mi (1,350.65 km) |
| Slough to Torre de Moncorvo | 776.87 mi (1,250.25 km) |
| Slough to Torres Novas | 915.41 mi (1,473.21 km) |
