| Llantrisant to Ilawa | 969.45 mi (1,560.18 km) |
| Llantrisant to Imielin | 986.58 mi (1,587.75 km) |
| Llantrisant to Inowroclaw | 917.47 mi (1,476.52 km) |
| Llantrisant to Janow Lubelski | 1,113.99 mi (1,792.79 km) |
| Llantrisant to Jarocin | 890.26 mi (1,432.74 km) |
| Llantrisant to Jaroslaw | 1,137.03 mi (1,829.88 km) |
| Llantrisant to Jasien | 929.52 mi (1,495.92 km) |
| Llantrisant to Jaslo | 1,090.31 mi (1,754.69 km) |
| Llantrisant to Jastrzebie-Zdroj | 962.60 mi (1,549.16 km) |
| Llantrisant to Jawor | 843.87 mi (1,358.08 km) |
| Llantrisant to Jaworzno | 987.66 mi (1,589.48 km) |
| Llantrisant to Jedrzejow | 1,024.90 mi (1,649.42 km) |
| Llantrisant to Jelcz-Laskowice | 892.54 mi (1,436.40 km) |
| Llantrisant to Jelenia Gora | 825.74 mi (1,328.89 km) |
| Llantrisant to Jozefoslaw | 1,038.77 mi (1,671.73 km) |
