| Llantrisant to Security-Widefield (Colorado) | 4,611.92 mi (7,422.17 km) |
| Llantrisant to Sedalia (Missouri) | 4,187.24 mi (6,738.71 km) |
| Llantrisant to Sedro-Woolley (Washington) | 4,642.15 mi (7,470.82 km) |
| Llantrisant to Seguin (Texas) | 4,830.91 mi (7,774.60 km) |
| Llantrisant to Selden (New York) | 3,280.85 mi (5,280.03 km) |
| Llantrisant to Selma (Alabama) | 4,246.49 mi (6,834.07 km) |
| Llantrisant to Selma (California) | 5,235.53 mi (8,425.77 km) |
| Llantrisant to Selma (Texas) | 4,844.73 mi (7,796.85 km) |
| Llantrisant to Seminole (Florida) | 4,295.69 mi (6,913.25 km) |
| Llantrisant to Seven Hills (Ohio) | 3,609.75 mi (5,809.33 km) |
| Llantrisant to Seven Oaks (South Carolina) | 3,924.33 mi (6,315.59 km) |
| Llantrisant to Severn (Maryland) | 3,506.53 mi (5,643.22 km) |
| Llantrisant to Severna Park (Maryland) | 3,503.44 mi (5,638.24 km) |
| Llantrisant to Sevierville (Tennessee) | 3,937.31 mi (6,336.49 km) |
| Llantrisant to Seymour (Indiana) | 3,888.06 mi (6,257.23 km) |
