| Swansea to Sesena | 4,413.99 mi (7,103.63 km) |
| Swansea to Sestao | 4,337.40 mi (6,980.37 km) |
| Swansea to Sevilla | 4,404.82 mi (7,088.87 km) |
| Swansea to Sevilla La Nueva | 4,390.52 mi (7,065.85 km) |
| Swansea to Silla | 4,590.48 mi (7,387.67 km) |
| Swansea to Silleda | 4,122.33 mi (6,634.26 km) |
| Swansea to Sitges | 4,622.04 mi (7,438.46 km) |
| Swansea to Socuellamos | 4,483.60 mi (7,215.66 km) |
| Swansea to Soller | 4,715.97 mi (7,589.63 km) |
| Swansea to Solsona | 4,581.91 mi (7,373.88 km) |
| Swansea to Son Servera | 4,750.90 mi (7,645.84 km) |
| Swansea to Sonseca | 4,416.19 mi (7,107.17 km) |
| Swansea to Sopelana | 4,336.23 mi (6,978.49 km) |
| Swansea to Soria | 4,413.18 mi (7,102.32 km) |
| Swansea to Suances | 4,287.19 mi (6,899.57 km) |
