| Llantrisant to Iselin (New Jersey) | 3,346.14 mi (5,385.09 km) |
| Llantrisant to Isla Vista (California) | 5,365.76 mi (8,635.36 km) |
| Llantrisant to Issaquah (Washington) | 4,691.07 mi (7,549.55 km) |
| Llantrisant to Ithaca (New York) | 3,356.04 mi (5,401.03 km) |
| Llantrisant to Ives Estates (Florida) | 4,279.48 mi (6,887.15 km) |
| Llantrisant to Jackson (Michigan) | 3,679.67 mi (5,921.85 km) |
| Llantrisant to Jackson (Mississippi) | 4,381.17 mi (7,050.82 km) |
| Llantrisant to Jackson (Missouri) | 4,111.33 mi (6,616.55 km) |
| Llantrisant to Jackson (Tennessee) | 4,161.87 mi (6,697.89 km) |
| Llantrisant to Jackson (Wyoming) | 4,572.96 mi (7,359.47 km) |
| Llantrisant to Jacksonville (Alabama) | 4,126.17 mi (6,640.43 km) |
| Llantrisant to Jacksonville (Arkansas) | 4,331.07 mi (6,970.18 km) |
| Llantrisant to Jacksonville (Florida) | 4,125.84 mi (6,639.90 km) |
| Llantrisant to Jacksonville (Illinois) | 4,022.28 mi (6,473.23 km) |
| Llantrisant to Jacksonville (North Carolina) | 3,735.69 mi (6,012.01 km) |
