| Houghton le Spring to Karlovo | 1,450.08 mi (2,333.68 km) |
| Houghton le Spring to Karnobat | 1,530.21 mi (2,462.63 km) |
| Houghton le Spring to Kavarna | 1,543.55 mi (2,484.11 km) |
| Houghton le Spring to Kazanlak | 1,472.89 mi (2,370.39 km) |
| Houghton le Spring to Knezha | 1,382.68 mi (2,225.21 km) |
| Houghton le Spring to Kostinbrod | 1,384.56 mi (2,228.23 km) |
| Houghton le Spring to Kozloduy | 1,356.52 mi (2,183.10 km) |
| Houghton le Spring to Kyustendil | 1,392.32 mi (2,240.71 km) |
| Houghton le Spring to Levski | 1,427.36 mi (2,297.12 km) |
| Houghton le Spring to Lom | 1,336.51 mi (2,150.91 km) |
| Houghton le Spring to Lovech | 1,423.16 mi (2,290.35 km) |
| Houghton le Spring to Lukovit | 1,400.04 mi (2,253.14 km) |
| Houghton le Spring to Lyaskovets | 1,461.39 mi (2,351.89 km) |
| Houghton le Spring to Mezdra | 1,385.59 mi (2,229.89 km) |
| Houghton le Spring to Momchilgrad | 1,526.65 mi (2,456.91 km) |
