| Rhondda to Southern Pines (North Carolina) | 3,794.99 mi (6,107.44 km) |
| Rhondda to Southfield (Michigan) | 3,620.73 mi (5,827.01 km) |
| Rhondda to Southgate (Michigan) | 3,630.55 mi (5,842.80 km) |
| Rhondda to Southlake (Texas) | 4,621.72 mi (7,437.94 km) |
| Rhondda to Spanaway (Washington) | 4,721.27 mi (7,598.15 km) |
| Rhondda to Spanish Fork (Utah) | 4,775.33 mi (7,685.15 km) |
| Rhondda to Spanish Lake (Missouri) | 4,062.12 mi (6,537.35 km) |
| Rhondda to Spanish Springs (Nevada) | 5,058.56 mi (8,140.97 km) |
| Rhondda to Sparks (Nevada) | 5,064.68 mi (8,150.82 km) |
| Rhondda to Spartanburg (South Carolina) | 3,911.11 mi (6,294.32 km) |
| Rhondda to Spearfish (South Dakota) | 4,284.17 mi (6,894.71 km) |
| Rhondda to Speedway (Indiana) | 3,859.46 mi (6,211.20 km) |
| Rhondda to Spencer (Iowa) | 4,042.70 mi (6,506.10 km) |
| Rhondda to Spokane (Washington) | 4,549.11 mi (7,321.08 km) |
| Rhondda to Spokane Valley (Washington) | 4,543.61 mi (7,312.23 km) |
