| Swansea to Secaucus (New Jersey) | 859.38 mi (1,383.03 km) |
| Swansea to Security-Widefield (Colorado) | 794.01 mi (1,277.84 km) |
| Swansea to Sedalia (Missouri) | 175.64 mi (282.67 km) |
| Swansea to Sedro-Woolley (Washington) | 1,739.38 mi (2,799.26 km) |
| Swansea to Seguin (Texas) | 768.74 mi (1,237.17 km) |
| Swansea to Selden (New York) | 913.01 mi (1,469.34 km) |
| Swansea to Selma (Alabama) | 455.13 mi (732.47 km) |
| Swansea to Selma (California) | 1,621.49 mi (2,609.54 km) |
| Swansea to Selma (Texas) | 780.73 mi (1,256.47 km) |
| Swansea to Seminole (Florida) | 848.20 mi (1,365.05 km) |
| Swansea to Seven Hills (Ohio) | 481.37 mi (774.68 km) |
| Swansea to Seven Oaks (South Carolina) | 582.03 mi (936.68 km) |
| Swansea to Severn (Maryland) | 715.70 mi (1,151.82 km) |
| Swansea to Severna Park (Maryland) | 722.57 mi (1,162.87 km) |
| Swansea to Sevierville (Tennessee) | 398.06 mi (640.62 km) |
