| Letchworth to Koscian | 715.97 mi (1,152.24 km) |
| Letchworth to Koscielisko | 897.86 mi (1,444.97 km) |
| Letchworth to Koscierzyna | 768.53 mi (1,236.82 km) |
| Letchworth to Kostrzyn | 738.06 mi (1,187.78 km) |
| Letchworth to Kostrzyn nad Odra | 629.94 mi (1,013.80 km) |
| Letchworth to Koszalin | 696.45 mi (1,120.83 km) |
| Letchworth to Kowary | 696.04 mi (1,120.16 km) |
| Letchworth to Kozienice | 928.63 mi (1,494.49 km) |
| Letchworth to Kozuchow | 674.27 mi (1,085.13 km) |
| Letchworth to Kozy | 853.94 mi (1,374.28 km) |
| Letchworth to Krakow | 883.54 mi (1,421.92 km) |
| Letchworth to Krapkowice | 792.19 mi (1,274.91 km) |
| Letchworth to Krasnik | 965.49 mi (1,553.81 km) |
| Letchworth to Krasnystaw | 1,005.44 mi (1,618.09 km) |
| Letchworth to Krosno | 968.38 mi (1,558.45 km) |
