| Middle Island to Sesimbra | 3,322.67 mi (5,347.32 km) |
| Middle Island to Setubal | 3,330.59 mi (5,360.07 km) |
| Middle Island to Sever do Vouga | 3,295.61 mi (5,303.76 km) |
| Middle Island to Silves | 3,391.88 mi (5,458.71 km) |
| Middle Island to Sines | 3,348.29 mi (5,388.55 km) |
| Middle Island to Sintra | 3,298.43 mi (5,308.31 km) |
| Middle Island to Sobrado de Paiva | 3,292.50 mi (5,298.77 km) |
| Middle Island to Sobral de Monte Agraco | 3,303.96 mi (5,317.20 km) |
| Middle Island to Soure | 3,301.00 mi (5,312.44 km) |
| Middle Island to Tabua | 3,321.93 mi (5,346.13 km) |
| Middle Island to Tavira | 3,433.16 mi (5,525.13 km) |
| Middle Island to Tomar | 3,323.85 mi (5,349.22 km) |
| Middle Island to Tondela | 3,315.10 mi (5,335.13 km) |
| Middle Island to Torre de Moncorvo | 3,342.58 mi (5,379.36 km) |
| Middle Island to Torres Novas | 3,321.84 mi (5,345.98 km) |
