| Irthlingborough to Karditsa | 1,395.92 mi (2,246.52 km) |
| Irthlingborough to Kastoria | 1,314.58 mi (2,115.62 km) |
| Irthlingborough to Katerini | 1,372.47 mi (2,208.78 km) |
| Irthlingborough to Keratsini | 1,529.18 mi (2,460.98 km) |
| Irthlingborough to Kerkyra | 1,311.55 mi (2,110.73 km) |
| Irthlingborough to Kiato | 1,495.68 mi (2,407.07 km) |
| Irthlingborough to Kifisia | 1,530.46 mi (2,463.04 km) |
| Irthlingborough to Kilkis | 1,351.73 mi (2,175.39 km) |
| Irthlingborough to Komotini | 1,444.63 mi (2,324.90 km) |
| Irthlingborough to Korinthos | 1,505.78 mi (2,423.32 km) |
| Irthlingborough to Koropi | 1,541.94 mi (2,481.51 km) |
| Irthlingborough to Korydallos | 1,529.53 mi (2,461.55 km) |
| Irthlingborough to Kos | 1,719.77 mi (2,767.70 km) |
| Irthlingborough to Kozani | 1,344.29 mi (2,163.42 km) |
| Irthlingborough to Lagos | 1,430.85 mi (2,302.74 km) |
