| Llantrisant to Somersworth (New Hampshire) | 3,093.83 mi (4,979.04 km) |
| Llantrisant to Somerton (Arizona) | 5,294.10 mi (8,520.03 km) |
| Llantrisant to Somerville (Massachusetts) | 3,137.50 mi (5,049.32 km) |
| Llantrisant to Somerville (New Jersey) | 3,358.18 mi (5,404.47 km) |
| Llantrisant to Sonoma (California) | 5,226.56 mi (8,411.33 km) |
| Llantrisant to Soquel (California) | 5,284.75 mi (8,504.98 km) |
| Llantrisant to South Bend (Indiana) | 3,778.03 mi (6,080.15 km) |
| Llantrisant to South Bradenton (Florida) | 4,306.27 mi (6,930.27 km) |
| Llantrisant to South Burlington (Vermont) | 3,140.84 mi (5,054.69 km) |
| Llantrisant to South Charleston (West Virginia) | 3,747.75 mi (6,031.42 km) |
| Llantrisant to South Daytona (Florida) | 4,154.95 mi (6,686.74 km) |
| Llantrisant to South El Monte (California) | 5,326.78 mi (8,572.62 km) |
| Llantrisant to South Elgin (Illinois) | 3,843.06 mi (6,184.81 km) |
| Llantrisant to South Euclid (Ohio) | 3,597.47 mi (5,789.57 km) |
| Llantrisant to South Farmingdale (New York) | 3,303.93 mi (5,317.17 km) |
