| Rhondda to Sinop | 1,913.73 mi (3,079.85 km) |
| Rhondda to Siran | 2,156.10 mi (3,469.91 km) |
| Rhondda to Sirnak | 2,410.50 mi (3,879.32 km) |
| Rhondda to Sirvan | 2,368.69 mi (3,812.03 km) |
| Rhondda to Sivas | 2,084.01 mi (3,353.89 km) |
| Rhondda to Sivasli | 1,830.70 mi (2,946.23 km) |
| Rhondda to Siverek | 2,266.65 mi (3,647.82 km) |
| Rhondda to Sivrice | 2,236.46 mi (3,599.23 km) |
| Rhondda to Sivrihisar | 1,865.19 mi (3,001.73 km) |
| Rhondda to Sogut | 1,784.24 mi (2,871.46 km) |
| Rhondda to Sogutlu | 1,760.12 mi (2,832.63 km) |
| Rhondda to Soke | 1,771.87 mi (2,851.55 km) |
| Rhondda to Solhan | 2,288.79 mi (3,683.44 km) |
| Rhondda to Soma | 1,714.11 mi (2,758.60 km) |
| Rhondda to Sorgun | 2,003.72 mi (3,224.68 km) |
