| Llantrisant to Isny im Allgau | 655.52 mi (1,054.96 km) |
| Llantrisant to Isselburg | 421.72 mi (678.69 km) |
| Llantrisant to Issum | 420.76 mi (677.15 km) |
| Llantrisant to Itzehoe | 563.00 mi (906.06 km) |
| Llantrisant to Jena | 647.50 mi (1,042.05 km) |
| Llantrisant to Jever | 493.42 mi (794.08 km) |
| Llantrisant to Jork | 564.82 mi (908.99 km) |
| Llantrisant to Juchen | 427.23 mi (687.57 km) |
| Llantrisant to Julich | 422.95 mi (680.68 km) |
| Llantrisant to Juterbog | 702.47 mi (1,130.52 km) |
| Llantrisant to Kaarst | 431.15 mi (693.86 km) |
| Llantrisant to Kaiserslautern | 510.23 mi (821.14 km) |
| Llantrisant to Kalkar | 414.45 mi (667.00 km) |
| Llantrisant to Kall | 436.18 mi (701.97 km) |
| Llantrisant to Kaltenkirchen | 579.60 mi (932.77 km) |
