| Didcot to Ilawa | 880.63 mi (1,417.24 km) |
| Didcot to Imielin | 894.84 mi (1,440.11 km) |
| Didcot to Inowroclaw | 827.37 mi (1,331.52 km) |
| Didcot to Janow Lubelski | 1,022.45 mi (1,645.47 km) |
| Didcot to Jarocin | 799.17 mi (1,286.15 km) |
| Didcot to Jaroslaw | 1,045.32 mi (1,682.28 km) |
| Didcot to Jasien | 842.21 mi (1,355.41 km) |
| Didcot to Jaslo | 998.57 mi (1,607.05 km) |
| Didcot to Jastrzebie-Zdroj | 870.89 mi (1,401.57 km) |
| Didcot to Jawor | 752.18 mi (1,210.52 km) |
| Didcot to Jaworzno | 895.92 mi (1,441.84 km) |
| Didcot to Jedrzejow | 933.24 mi (1,501.90 km) |
| Didcot to Jelcz-Laskowice | 800.88 mi (1,288.89 km) |
| Didcot to Jelenia Gora | 734.01 mi (1,181.27 km) |
| Didcot to Jozefoslaw | 948.04 mi (1,525.72 km) |
