| Helensburgh to Sesimbra | 1,230.72 mi (1,980.65 km) |
| Helensburgh to Setubal | 1,223.68 mi (1,969.32 km) |
| Helensburgh to Sever do Vouga | 1,068.69 mi (1,719.88 km) |
| Helensburgh to Silves | 1,312.38 mi (2,112.07 km) |
| Helensburgh to Sines | 1,262.50 mi (2,031.79 km) |
| Helensburgh to Sintra | 1,208.68 mi (1,945.18 km) |
| Helensburgh to Sobrado de Paiva | 1,047.45 mi (1,685.71 km) |
| Helensburgh to Sobral de Monte Agraco | 1,191.84 mi (1,918.09 km) |
| Helensburgh to Soure | 1,117.36 mi (1,798.21 km) |
| Helensburgh to Tabua | 1,092.03 mi (1,757.46 km) |
| Helensburgh to Tavira | 1,312.89 mi (2,112.90 km) |
| Helensburgh to Tomar | 1,146.67 mi (1,845.39 km) |
| Helensburgh to Tondela | 1,081.64 mi (1,740.74 km) |
| Helensburgh to Torre de Moncorvo | 1,029.42 mi (1,656.70 km) |
| Helensburgh to Torres Novas | 1,156.60 mi (1,861.37 km) |
