| Rhondda to Superior (Colorado) | 4,562.14 mi (7,342.05 km) |
| Rhondda to Superior (Wisconsin) | 3,767.33 mi (6,062.93 km) |
| Rhondda to Surprise (Arizona) | 5,151.70 mi (8,290.87 km) |
| Rhondda to Susanville (California) | 5,044.49 mi (8,118.33 km) |
| Rhondda to Sussex (Wisconsin) | 3,783.72 mi (6,089.30 km) |
| Rhondda to Suwanee (Georgia) | 4,042.04 mi (6,505.03 km) |
| Rhondda to Swansea (Illinois) | 4,064.76 mi (6,541.60 km) |
| Rhondda to Sweetwater (Florida) | 4,294.54 mi (6,911.40 km) |
| Rhondda to Sweetwater (Texas) | 4,773.04 mi (7,681.46 km) |
| Rhondda to Sycamore (Illinois) | 3,853.12 mi (6,200.99 km) |
| Rhondda to Sylacauga (Alabama) | 4,174.28 mi (6,717.85 km) |
| Rhondda to Sylvania (Ohio) | 3,672.32 mi (5,910.02 km) |
| Rhondda to Syosset (New York) | 3,298.86 mi (5,309.01 km) |
| Rhondda to Syracuse (New York) | 3,313.13 mi (5,331.97 km) |
| Rhondda to Syracuse (Utah) | 4,737.29 mi (7,623.93 km) |
