| Welwyn Garden City to Isny im Allgau | 537.31 mi (864.72 km) |
| Welwyn Garden City to Isselburg | 284.35 mi (457.61 km) |
| Welwyn Garden City to Issum | 284.02 mi (457.09 km) |
| Welwyn Garden City to Itzehoe | 430.22 mi (692.37 km) |
| Welwyn Garden City to Jena | 511.17 mi (822.65 km) |
| Welwyn Garden City to Jever | 360.07 mi (579.47 km) |
| Welwyn Garden City to Jork | 430.22 mi (692.38 km) |
| Welwyn Garden City to Juchen | 292.23 mi (470.30 km) |
| Welwyn Garden City to Julich | 289.05 mi (465.18 km) |
| Welwyn Garden City to Juterbog | 564.94 mi (909.18 km) |
| Welwyn Garden City to Kaarst | 295.54 mi (475.62 km) |
| Welwyn Garden City to Kaiserslautern | 384.98 mi (619.56 km) |
| Welwyn Garden City to Kalkar | 277.24 mi (446.17 km) |
| Welwyn Garden City to Kall | 304.57 mi (490.15 km) |
| Welwyn Garden City to Kaltenkirchen | 446.14 mi (717.99 km) |
