| Boston to Sesimbra | 1,093.28 mi (1,759.47 km) |
| Boston to Setubal | 1,084.18 mi (1,744.83 km) |
| Boston to Sever do Vouga | 931.67 mi (1,499.38 km) |
| Boston to Silves | 1,163.61 mi (1,872.66 km) |
| Boston to Sines | 1,120.72 mi (1,803.62 km) |
| Boston to Sintra | 1,075.90 mi (1,731.49 km) |
| Boston to Sobrado de Paiva | 910.51 mi (1,465.32 km) |
| Boston to Sobral de Monte Agraco | 1,057.19 mi (1,701.39 km) |
| Boston to Soure | 980.72 mi (1,578.32 km) |
| Boston to Tabua | 949.23 mi (1,527.64 km) |
| Boston to Tavira | 1,155.61 mi (1,859.77 km) |
| Boston to Tomar | 1,005.62 mi (1,618.39 km) |
| Boston to Tondela | 940.14 mi (1,513.01 km) |
| Boston to Torre de Moncorvo | 878.57 mi (1,413.92 km) |
| Boston to Torres Novas | 1,016.42 mi (1,635.77 km) |
