| Wellingborough to Karlovo | 1,354.77 mi (2,180.30 km) |
| Wellingborough to Karnobat | 1,442.72 mi (2,321.83 km) |
| Wellingborough to Kavarna | 1,465.39 mi (2,358.31 km) |
| Wellingborough to Kazanlak | 1,379.62 mi (2,220.28 km) |
| Wellingborough to Knezha | 1,289.75 mi (2,075.65 km) |
| Wellingborough to Kostinbrod | 1,284.24 mi (2,066.78 km) |
| Wellingborough to Kozloduy | 1,264.03 mi (2,034.26 km) |
| Wellingborough to Kyustendil | 1,286.92 mi (2,071.10 km) |
| Wellingborough to Levski | 1,337.52 mi (2,152.53 km) |
| Wellingborough to Lom | 1,242.40 mi (1,999.45 km) |
| Wellingborough to Lovech | 1,330.38 mi (2,141.05 km) |
| Wellingborough to Lukovit | 1,305.59 mi (2,101.15 km) |
| Wellingborough to Lyaskovets | 1,372.08 mi (2,208.15 km) |
| Wellingborough to Mezdra | 1,289.08 mi (2,074.58 km) |
| Wellingborough to Momchilgrad | 1,427.55 mi (2,297.42 km) |
