| Letchworth to Jozefow | 908.60 mi (1,462.26 km) |
| Letchworth to Kalisz | 779.25 mi (1,254.09 km) |
| Letchworth to Kamien Pomorski | 637.89 mi (1,026.58 km) |
| Letchworth to Kamienna Gora | 704.68 mi (1,134.07 km) |
| Letchworth to Karczew | 909.78 mi (1,464.15 km) |
| Letchworth to Kartuzy | 778.33 mi (1,252.60 km) |
| Letchworth to Katowice | 840.47 mi (1,352.61 km) |
| Letchworth to Kedzierzyn-Kozle | 804.19 mi (1,294.22 km) |
| Letchworth to Kepno | 780.56 mi (1,256.18 km) |
| Letchworth to Ketrzyn | 906.09 mi (1,458.22 km) |
| Letchworth to Kety | 856.10 mi (1,377.76 km) |
| Letchworth to Kielce | 898.93 mi (1,446.69 km) |
| Letchworth to Kielczow | 748.22 mi (1,204.14 km) |
| Letchworth to Klobuck | 826.03 mi (1,329.37 km) |
| Letchworth to Klodzko | 736.75 mi (1,185.69 km) |
