| South Portland to Sesimbra | 3,136.57 mi (5,047.81 km) |
| South Portland to Setubal | 3,144.01 mi (5,059.79 km) |
| South Portland to Sever do Vouga | 3,101.96 mi (4,992.12 km) |
| South Portland to Silves | 3,208.82 mi (5,164.09 km) |
| South Portland to Sines | 3,163.40 mi (5,091.00 km) |
| South Portland to Sintra | 3,111.57 mi (5,007.59 km) |
| South Portland to Sobrado de Paiva | 3,097.90 mi (4,985.59 km) |
| South Portland to Sobral de Monte Agraco | 3,116.17 mi (5,014.99 km) |
| South Portland to Soure | 3,109.60 mi (5,004.41 km) |
| South Portland to Tabua | 3,129.03 mi (5,035.68 km) |
| South Portland to Tavira | 3,249.34 mi (5,229.30 km) |
| South Portland to Tomar | 3,133.54 mi (5,042.95 km) |
| South Portland to Tondela | 3,121.80 mi (5,024.05 km) |
| South Portland to Torre de Moncorvo | 3,146.45 mi (5,063.73 km) |
| South Portland to Torres Novas | 3,132.04 mi (5,040.54 km) |
