| Letchworth to Klaukkala | 1,112.29 mi (1,790.05 km) |
| Letchworth to Kokkola | 1,173.45 mi (1,888.48 km) |
| Letchworth to Kontiolahti | 1,326.75 mi (2,135.20 km) |
| Letchworth to Korsholm | 1,108.38 mi (1,783.77 km) |
| Letchworth to Kotka | 1,184.93 mi (1,906.96 km) |
| Letchworth to Kouvola | 1,185.98 mi (1,908.65 km) |
| Letchworth to Kuhmo | 1,352.68 mi (2,176.92 km) |
| Letchworth to Kuopio | 1,266.39 mi (2,038.06 km) |
| Letchworth to Kurikka | 1,109.26 mi (1,785.19 km) |
| Letchworth to Kuusamo | 1,401.24 mi (2,255.08 km) |
| Letchworth to Kuusankoski | 1,184.33 mi (1,905.99 km) |
| Letchworth to Lahti | 1,155.42 mi (1,859.47 km) |
| Letchworth to Laitila | 1,031.31 mi (1,659.73 km) |
| Letchworth to Lapinlahti | 1,271.54 mi (2,046.34 km) |
| Letchworth to Lappeenranta | 1,237.37 mi (1,991.36 km) |
