| Swansea to Siloam Springs (Arkansas) | 298.33 mi (480.12 km) |
| Swansea to Silver Firs (Washington) | 1,727.44 mi (2,780.05 km) |
| Swansea to Silver Spring (Maryland) | 698.47 mi (1,124.07 km) |
| Swansea to Silver Springs Shores (Florida) | 795.81 mi (1,280.74 km) |
| Swansea to Silverdale (Washington) | 1,749.63 mi (2,815.75 km) |
| Swansea to Silverton (Oregon) | 1,734.60 mi (2,791.57 km) |
| Swansea to Simi Valley (California) | 1,619.71 mi (2,606.68 km) |
| Swansea to Simpsonville (South Carolina) | 503.05 mi (809.59 km) |
| Swansea to Sioux City (Iowa) | 432.72 mi (696.40 km) |
| Swansea to Sioux Falls (South Dakota) | 491.99 mi (791.77 km) |
| Swansea to Skokie (Illinois) | 268.30 mi (431.78 km) |
| Swansea to Sleepy Hollow (New York) | 871.60 mi (1,402.71 km) |
| Swansea to Slidell (Louisiana) | 570.97 mi (918.88 km) |
| Swansea to Smithfield (North Carolina) | 674.69 mi (1,085.81 km) |
| Swansea to Smithfield (Utah) | 1,171.49 mi (1,885.32 km) |
