| Rhondda to Sestu | 1,041.72 mi (1,676.48 km) |
| Rhondda to Settimo Torinese | 679.92 mi (1,094.22 km) |
| Rhondda to Seveso | 704.84 mi (1,134.33 km) |
| Rhondda to Sezze | 1,045.32 mi (1,682.28 km) |
| Rhondda to Siano | 1,138.16 mi (1,831.70 km) |
| Rhondda to Siena | 893.33 mi (1,437.68 km) |
| Rhondda to Signa | 862.55 mi (1,388.14 km) |
| Rhondda to Silea | 824.86 mi (1,327.48 km) |
| Rhondda to Silvi Paese | 1,031.36 mi (1,659.82 km) |
| Rhondda to Sinalunga | 912.61 mi (1,468.70 km) |
| Rhondda to Siniscola | 985.26 mi (1,585.62 km) |
| Rhondda to Sinnai | 1,044.61 mi (1,681.14 km) |
| Rhondda to Siracusa | 1,357.56 mi (2,184.78 km) |
| Rhondda to Solaro | 704.15 mi (1,133.21 km) |
| Rhondda to Soliera | 811.61 mi (1,306.16 km) |
