| Duluth to Sesimbra | 4,062.57 mi (6,538.07 km) |
| Duluth to Setubal | 4,068.08 mi (6,546.95 km) |
| Duluth to Sever do Vouga | 3,998.70 mi (6,435.29 km) |
| Duluth to Silves | 4,144.26 mi (6,669.54 km) |
| Duluth to Sines | 4,093.27 mi (6,587.49 km) |
| Duluth to Sintra | 4,035.30 mi (6,494.18 km) |
| Duluth to Sobrado de Paiva | 3,990.59 mi (6,422.24 km) |
| Duluth to Sobral de Monte Agraco | 4,036.32 mi (6,495.83 km) |
| Duluth to Soure | 4,015.60 mi (6,462.49 km) |
| Duluth to Tabua | 4,028.30 mi (6,482.93 km) |
| Duluth to Tavira | 4,181.36 mi (6,729.24 km) |
| Duluth to Tomar | 4,043.46 mi (6,507.32 km) |
| Duluth to Tondela | 4,019.56 mi (6,468.85 km) |
| Duluth to Torre de Moncorvo | 4,031.13 mi (6,487.47 km) |
| Duluth to Torres Novas | 4,044.05 mi (6,508.27 km) |
