| Welwyn Garden City to Ilawa | 833.69 mi (1,341.69 km) |
| Welwyn Garden City to Imielin | 849.81 mi (1,367.64 km) |
| Welwyn Garden City to Inowroclaw | 780.55 mi (1,256.18 km) |
| Welwyn Garden City to Janow Lubelski | 976.51 mi (1,571.55 km) |
| Welwyn Garden City to Jarocin | 752.76 mi (1,211.45 km) |
| Welwyn Garden City to Jaroslaw | 999.86 mi (1,609.12 km) |
| Welwyn Garden City to Jasien | 795.34 mi (1,279.98 km) |
| Welwyn Garden City to Jaslo | 953.52 mi (1,534.55 km) |
| Welwyn Garden City to Jastrzebie-Zdroj | 826.18 mi (1,329.61 km) |
| Welwyn Garden City to Jawor | 706.64 mi (1,137.22 km) |
| Welwyn Garden City to Jaworzno | 850.81 mi (1,369.24 km) |
| Welwyn Garden City to Jedrzejow | 887.59 mi (1,428.44 km) |
| Welwyn Garden City to Jelcz-Laskowice | 755.22 mi (1,215.41 km) |
| Welwyn Garden City to Jelenia Gora | 688.69 mi (1,108.34 km) |
| Welwyn Garden City to Jozefoslaw | 901.43 mi (1,450.71 km) |
