| Gaithersburg to Sesimbra | 3,576.69 mi (5,756.12 km) |
| Gaithersburg to Setubal | 3,584.71 mi (5,769.04 km) |
| Gaithersburg to Sever do Vouga | 3,551.03 mi (5,714.83 km) |
| Gaithersburg to Silves | 3,645.14 mi (5,866.29 km) |
| Gaithersburg to Sines | 3,602.02 mi (5,796.88 km) |
| Gaithersburg to Sintra | 3,552.62 mi (5,717.39 km) |
| Gaithersburg to Sobrado de Paiva | 3,548.05 mi (5,710.04 km) |
| Gaithersburg to Sobral de Monte Agraco | 3,558.34 mi (5,726.60 km) |
| Gaithersburg to Soure | 3,556.07 mi (5,722.93 km) |
| Gaithersburg to Tabua | 3,577.24 mi (5,757.01 km) |
| Gaithersburg to Tavira | 3,686.59 mi (5,933.00 km) |
| Gaithersburg to Tomar | 3,578.72 mi (5,759.40 km) |
| Gaithersburg to Tondela | 3,570.46 mi (5,746.11 km) |
| Gaithersburg to Torre de Moncorvo | 3,598.31 mi (5,790.92 km) |
| Gaithersburg to Torres Novas | 3,576.61 mi (5,756.00 km) |
