| Letchworth to Karis | 1,069.83 mi (1,721.72 km) |
| Letchworth to Karkkila | 1,099.07 mi (1,768.79 km) |
| Letchworth to Kauhajoki | 1,096.67 mi (1,764.92 km) |
| Letchworth to Kauhava | 1,144.52 mi (1,841.93 km) |
| Letchworth to Kauniainen | 1,107.87 mi (1,782.94 km) |
| Letchworth to Kemi | 1,282.55 mi (2,064.06 km) |
| Letchworth to Kemijarvi | 1,386.81 mi (2,231.86 km) |
| Letchworth to Kempele | 1,273.33 mi (2,049.23 km) |
| Letchworth to Kerava | 1,123.96 mi (1,808.85 km) |
| Letchworth to Keuruu | 1,162.22 mi (1,870.42 km) |
| Letchworth to Kiiminki | 1,288.06 mi (2,072.93 km) |
| Letchworth to Kirkkonummi | 1,095.29 mi (1,762.69 km) |
| Letchworth to Kitee | 1,320.25 mi (2,124.74 km) |
| Letchworth to Kiuruvesi | 1,258.99 mi (2,026.15 km) |
| Letchworth to Kivisto | 1,113.99 mi (1,792.79 km) |
