| Rhondda to Smyrna (Delaware) | 3,451.55 mi (5,554.73 km) |
| Rhondda to Smyrna (Georgia) | 4,069.49 mi (6,549.22 km) |
| Rhondda to Smyrna (Tennessee) | 4,050.33 mi (6,518.37 km) |
| Rhondda to Snellville (Georgia) | 4,048.73 mi (6,515.80 km) |
| Rhondda to Snoqualmie (Washington) | 4,681.13 mi (7,533.55 km) |
| Rhondda to Snyder (Texas) | 4,779.63 mi (7,692.08 km) |
| Rhondda to Socastee (South Carolina) | 3,849.37 mi (6,194.97 km) |
| Rhondda to Socorro (Texas) | 5,038.41 mi (8,108.53 km) |
| Rhondda to Soddy-Daisy (Tennessee) | 4,029.48 mi (6,484.82 km) |
| Rhondda to Solana Beach (California) | 5,355.04 mi (8,618.10 km) |
| Rhondda to Soledad (California) | 5,292.70 mi (8,517.78 km) |
| Rhondda to Solon (Ohio) | 3,596.57 mi (5,788.12 km) |
| Rhondda to Somers Point (New Jersey) | 3,409.11 mi (5,486.43 km) |
| Rhondda to Somerset (Kentucky) | 3,920.11 mi (6,308.80 km) |
| Rhondda to Somerset (New Jersey) | 3,353.16 mi (5,396.38 km) |
