| Letchworth to Kanjiza | 1,001.18 mi (1,611.25 km) |
| Letchworth to Kikinda | 1,026.01 mi (1,651.20 km) |
| Letchworth to Kladovo | 1,160.33 mi (1,867.36 km) |
| Letchworth to Knic | 1,112.17 mi (1,789.87 km) |
| Letchworth to Knjazevac | 1,197.82 mi (1,927.70 km) |
| Letchworth to Koceljeva | 1,053.14 mi (1,694.86 km) |
| Letchworth to Kosjeric | 1,077.15 mi (1,733.50 km) |
| Letchworth to Kovacica | 1,060.12 mi (1,706.10 km) |
| Letchworth to Kovin | 1,088.19 mi (1,751.27 km) |
| Letchworth to Kragujevac | 1,116.92 mi (1,797.51 km) |
| Letchworth to Kraljevo | 1,119.17 mi (1,801.12 km) |
| Letchworth to Krupanj | 1,040.10 mi (1,673.88 km) |
| Letchworth to Krusevac | 1,150.35 mi (1,851.30 km) |
| Letchworth to Kucevo | 1,126.96 mi (1,813.66 km) |
| Letchworth to Kula | 997.45 mi (1,605.24 km) |
