| Irthlingborough to Jozefow | 921.16 mi (1,482.47 km) |
| Irthlingborough to Kalisz | 793.23 mi (1,276.58 km) |
| Irthlingborough to Kamien Pomorski | 646.33 mi (1,040.16 km) |
| Irthlingborough to Kamienna Gora | 721.41 mi (1,161.00 km) |
| Irthlingborough to Karczew | 922.44 mi (1,484.52 km) |
| Irthlingborough to Kartuzy | 786.19 mi (1,265.26 km) |
| Irthlingborough to Katowice | 857.21 mi (1,379.54 km) |
| Irthlingborough to Kedzierzyn-Kozle | 821.06 mi (1,321.37 km) |
| Irthlingborough to Kepno | 795.59 mi (1,280.38 km) |
| Irthlingborough to Ketrzyn | 914.64 mi (1,471.98 km) |
| Irthlingborough to Kety | 873.43 mi (1,405.65 km) |
| Irthlingborough to Kielce | 914.03 mi (1,471.00 km) |
| Irthlingborough to Kielczow | 763.79 mi (1,229.20 km) |
| Irthlingborough to Klobuck | 841.54 mi (1,354.34 km) |
| Irthlingborough to Klodzko | 754.01 mi (1,213.47 km) |
