| Llantrisant to Superior (Colorado) | 4,566.55 mi (7,349.15 km) |
| Llantrisant to Superior (Wisconsin) | 3,771.62 mi (6,069.84 km) |
| Llantrisant to Surprise (Arizona) | 5,156.14 mi (8,298.01 km) |
| Llantrisant to Susanville (California) | 5,049.39 mi (8,126.21 km) |
| Llantrisant to Sussex (Wisconsin) | 3,787.67 mi (6,095.67 km) |
| Llantrisant to Suwanee (Georgia) | 4,045.24 mi (6,510.19 km) |
| Llantrisant to Swansea (Illinois) | 4,068.52 mi (6,547.65 km) |
| Llantrisant to Sweetwater (Florida) | 4,296.99 mi (6,915.34 km) |
| Llantrisant to Sweetwater (Texas) | 4,776.94 mi (7,687.74 km) |
| Llantrisant to Sycamore (Illinois) | 3,857.02 mi (6,207.28 km) |
| Llantrisant to Sylacauga (Alabama) | 4,177.54 mi (6,723.10 km) |
| Llantrisant to Sylvania (Ohio) | 3,676.00 mi (5,915.95 km) |
| Llantrisant to Syosset (New York) | 3,302.03 mi (5,314.10 km) |
| Llantrisant to Syracuse (New York) | 3,316.60 mi (5,337.54 km) |
| Llantrisant to Syracuse (Utah) | 4,741.97 mi (7,631.46 km) |
