| Letchworth to Ilawa | 831.94 mi (1,338.88 km) |
| Letchworth to Imielin | 851.49 mi (1,370.34 km) |
| Letchworth to Inowroclaw | 779.65 mi (1,254.73 km) |
| Letchworth to Janow Lubelski | 977.21 mi (1,572.67 km) |
| Letchworth to Jarocin | 752.79 mi (1,211.50 km) |
| Letchworth to Jaroslaw | 1,001.09 mi (1,611.10 km) |
| Letchworth to Jasien | 792.82 mi (1,275.92 km) |
| Letchworth to Jaslo | 955.16 mi (1,537.19 km) |
| Letchworth to Jastrzebie-Zdroj | 828.15 mi (1,332.77 km) |
| Letchworth to Jawor | 707.84 mi (1,139.16 km) |
| Letchworth to Jaworzno | 852.41 mi (1,371.82 km) |
| Letchworth to Jedrzejow | 888.64 mi (1,430.13 km) |
| Letchworth to Jelcz-Laskowice | 756.29 mi (1,217.13 km) |
| Letchworth to Jelenia Gora | 690.13 mi (1,110.66 km) |
| Letchworth to Jozefoslaw | 901.05 mi (1,450.11 km) |
