| Letchworth to Kidricevo | 817.31 mi (1,315.33 km) |
| Letchworth to Kobarid | 737.64 mi (1,187.12 km) |
| Letchworth to Kobilje | 830.61 mi (1,336.74 km) |
| Letchworth to Kocevje | 811.84 mi (1,306.53 km) |
| Letchworth to Komen | 762.56 mi (1,227.22 km) |
| Letchworth to Komenda | 776.01 mi (1,248.87 km) |
| Letchworth to Koper | 773.60 mi (1,244.99 km) |
| Letchworth to Kostanjevica na Krki | 825.02 mi (1,327.74 km) |
| Letchworth to Kostel | 819.51 mi (1,318.87 km) |
| Letchworth to Kozje | 820.98 mi (1,321.23 km) |
| Letchworth to Kranj | 768.31 mi (1,236.48 km) |
| Letchworth to Kranjska Gora | 735.73 mi (1,184.04 km) |
| Letchworth to Krizevci | 824.89 mi (1,327.53 km) |
| Letchworth to Krsko | 823.04 mi (1,324.56 km) |
| Letchworth to Kuzma | 812.61 mi (1,307.77 km) |
