| Potomac to Sesena | 3,796.42 mi (6,109.75 km) |
| Potomac to Sestao | 3,740.43 mi (6,019.64 km) |
| Potomac to Sevilla | 3,767.78 mi (6,063.65 km) |
| Potomac to Sevilla La Nueva | 3,773.59 mi (6,073.01 km) |
| Potomac to Silla | 3,976.21 mi (6,399.08 km) |
| Potomac to Silleda | 3,510.56 mi (5,649.70 km) |
| Potomac to Sitges | 4,023.63 mi (6,475.40 km) |
| Potomac to Socuellamos | 3,863.60 mi (6,217.86 km) |
| Potomac to Soller | 4,111.37 mi (6,616.61 km) |
| Potomac to Solsona | 3,987.34 mi (6,417.00 km) |
| Potomac to Son Servera | 4,147.14 mi (6,674.17 km) |
| Potomac to Sonseca | 3,795.87 mi (6,108.87 km) |
| Potomac to Sopelana | 3,739.77 mi (6,018.58 km) |
| Potomac to Soria | 3,807.89 mi (6,128.21 km) |
| Potomac to Suances | 3,688.71 mi (5,936.41 km) |
