| Gaithersburg to Sesena | 3,793.63 mi (6,105.26 km) |
| Gaithersburg to Sestao | 3,737.11 mi (6,014.30 km) |
| Gaithersburg to Sevilla | 3,765.56 mi (6,060.09 km) |
| Gaithersburg to Sevilla La Nueva | 3,770.78 mi (6,068.49 km) |
| Gaithersburg to Silla | 3,973.35 mi (6,394.48 km) |
| Gaithersburg to Silleda | 3,507.58 mi (5,644.90 km) |
| Gaithersburg to Sitges | 4,020.38 mi (6,470.17 km) |
| Gaithersburg to Socuellamos | 3,860.88 mi (6,213.49 km) |
| Gaithersburg to Soller | 4,108.27 mi (6,611.63 km) |
| Gaithersburg to Solsona | 3,983.99 mi (6,411.62 km) |
| Gaithersburg to Son Servera | 4,144.03 mi (6,669.17 km) |
| Gaithersburg to Sonseca | 3,793.16 mi (6,104.50 km) |
| Gaithersburg to Sopelana | 3,736.44 mi (6,013.23 km) |
| Gaithersburg to Soria | 3,804.78 mi (6,123.20 km) |
| Gaithersburg to Suances | 3,685.42 mi (5,931.12 km) |
