| Letchworth to Krosno Odrzanskie | 650.83 mi (1,047.41 km) |
| Letchworth to Krotoszyn | 752.62 mi (1,211.23 km) |
| Letchworth to Kruszwica | 782.99 mi (1,260.10 km) |
| Letchworth to Krynica | 940.47 mi (1,513.54 km) |
| Letchworth to Krzeszowice | 869.22 mi (1,398.87 km) |
| Letchworth to Kudowa-Zdroj | 719.20 mi (1,157.44 km) |
| Letchworth to Kutno | 829.29 mi (1,334.61 km) |
| Letchworth to Kwidzyn | 806.00 mi (1,297.14 km) |
| Letchworth to Lancut | 981.15 mi (1,579.01 km) |
| Letchworth to Lapy | 970.85 mi (1,562.43 km) |
| Letchworth to Lask | 825.63 mi (1,328.72 km) |
| Letchworth to Laziska Gorne | 835.57 mi (1,344.72 km) |
| Letchworth to Lebork | 761.71 mi (1,225.86 km) |
| Letchworth to Leczna | 988.03 mi (1,590.08 km) |
| Letchworth to Leczyca | 823.80 mi (1,325.78 km) |
