| Shannon to Setubal | 980.39 mi (1,577.79 km) |
| Shannon to Sever do Vouga | 828.10 mi (1,332.70 km) |
| Shannon to Silves | 1,073.00 mi (1,726.82 km) |
| Shannon to Sines | 1,019.75 mi (1,641.13 km) |
| Shannon to Sintra | 961.72 mi (1,547.74 km) |
| Shannon to Sobrado de Paiva | 807.53 mi (1,299.59 km) |
| Shannon to Sobral de Monte Agraco | 946.38 mi (1,523.05 km) |
| Shannon to Soure | 875.05 mi (1,408.25 km) |
| Shannon to Tabua | 854.45 mi (1,375.11 km) |
| Shannon to Tavira | 1,079.26 mi (1,736.89 km) |
| Shannon to Tomar | 906.32 mi (1,458.58 km) |
| Shannon to Tondela | 843.54 mi (1,357.55 km) |
| Shannon to Torre de Moncorvo | 799.65 mi (1,286.92 km) |
| Shannon to Torres Novas | 915.42 mi (1,473.22 km) |
| Shannon to Torres Vedras | 941.96 mi (1,515.94 km) |
