| Luton to Karlovo | 1,334.14 mi (2,147.10 km) |
| Luton to Karnobat | 1,423.25 mi (2,290.49 km) |
| Luton to Kavarna | 1,447.40 mi (2,329.36 km) |
| Luton to Kazanlak | 1,359.28 mi (2,187.56 km) |
| Luton to Knezha | 1,269.57 mi (2,043.18 km) |
| Luton to Kostinbrod | 1,262.88 mi (2,032.41 km) |
| Luton to Kozloduy | 1,243.96 mi (2,001.97 km) |
| Luton to Kyustendil | 1,264.76 mi (2,035.43 km) |
| Luton to Levski | 1,317.79 mi (2,120.77 km) |
| Luton to Lom | 1,222.10 mi (1,966.78 km) |
| Luton to Lovech | 1,310.19 mi (2,108.54 km) |
| Luton to Lukovit | 1,285.16 mi (2,068.26 km) |
| Luton to Lyaskovets | 1,352.39 mi (2,176.46 km) |
| Luton to Mezdra | 1,268.33 mi (2,041.19 km) |
| Luton to Momchilgrad | 1,406.23 mi (2,263.12 km) |
