| Llantwit Major to Superior (Colorado) | 4,568.37 mi (7,352.08 km) |
| Llantwit Major to Superior (Wisconsin) | 3,773.07 mi (6,072.17 km) |
| Llantwit Major to Surprise (Arizona) | 5,158.06 mi (8,301.10 km) |
| Llantwit Major to Susanville (California) | 5,052.97 mi (8,131.98 km) |
| Llantwit Major to Sussex (Wisconsin) | 3,788.14 mi (6,096.42 km) |
| Llantwit Major to Suwanee (Georgia) | 4,043.79 mi (6,507.86 km) |
| Llantwit Major to Swansea (Illinois) | 4,068.45 mi (6,547.54 km) |
| Llantwit Major to Sweetwater (Florida) | 4,293.91 mi (6,910.38 km) |
| Llantwit Major to Sweetwater (Texas) | 4,777.24 mi (7,688.23 km) |
| Llantwit Major to Sycamore (Illinois) | 3,857.35 mi (6,207.81 km) |
| Llantwit Major to Sylacauga (Alabama) | 4,176.22 mi (6,720.98 km) |
| Llantwit Major to Sylvania (Ohio) | 3,675.75 mi (5,915.55 km) |
| Llantwit Major to Syosset (New York) | 3,300.49 mi (5,311.63 km) |
| Llantwit Major to Syracuse (New York) | 3,315.78 mi (5,336.23 km) |
| Llantwit Major to Syracuse (Utah) | 4,744.69 mi (7,635.84 km) |
