| Letchworth to Sesimbra | 1,028.18 mi (1,654.70 km) |
| Letchworth to Setubal | 1,018.89 mi (1,639.75 km) |
| Letchworth to Sever do Vouga | 867.16 mi (1,395.56 km) |
| Letchworth to Silves | 1,097.23 mi (1,765.81 km) |
| Letchworth to Sines | 1,055.10 mi (1,698.01 km) |
| Letchworth to Sintra | 1,011.36 mi (1,627.62 km) |
| Letchworth to Sobrado de Paiva | 846.09 mi (1,361.64 km) |
| Letchworth to Sobral de Monte Agraco | 992.50 mi (1,597.28 km) |
| Letchworth to Soure | 916.06 mi (1,474.26 km) |
| Letchworth to Tabua | 884.00 mi (1,422.66 km) |
| Letchworth to Tavira | 1,088.49 mi (1,751.76 km) |
| Letchworth to Tomar | 940.39 mi (1,513.41 km) |
| Letchworth to Tondela | 875.09 mi (1,408.32 km) |
| Letchworth to Torre de Moncorvo | 812.74 mi (1,307.99 km) |
| Letchworth to Torres Novas | 951.26 mi (1,530.90 km) |
