| Llantrisant to Smyrna (Delaware) | 3,454.69 mi (5,559.79 km) |
| Llantrisant to Smyrna (Georgia) | 4,072.71 mi (6,554.39 km) |
| Llantrisant to Smyrna (Tennessee) | 4,053.77 mi (6,523.92 km) |
| Llantrisant to Snellville (Georgia) | 4,051.92 mi (6,520.93 km) |
| Llantrisant to Snoqualmie (Washington) | 4,686.22 mi (7,541.74 km) |
| Llantrisant to Snyder (Texas) | 4,783.57 mi (7,698.41 km) |
| Llantrisant to Socastee (South Carolina) | 3,852.28 mi (6,199.65 km) |
| Llantrisant to Socorro (Texas) | 5,042.52 mi (8,115.16 km) |
| Llantrisant to Soddy-Daisy (Tennessee) | 4,032.82 mi (6,490.19 km) |
| Llantrisant to Solana Beach (California) | 5,359.63 mi (8,625.49 km) |
| Llantrisant to Soledad (California) | 5,297.52 mi (8,525.54 km) |
| Llantrisant to Solon (Ohio) | 3,600.14 mi (5,793.87 km) |
| Llantrisant to Somers Point (New Jersey) | 3,412.20 mi (5,491.41 km) |
| Llantrisant to Somerset (Kentucky) | 3,923.53 mi (6,314.32 km) |
| Llantrisant to Somerset (New Jersey) | 3,356.34 mi (5,401.51 km) |
