| Billingham to Karlovo | 1,436.28 mi (2,311.46 km) |
| Billingham to Karnobat | 1,517.01 mi (2,441.40 km) |
| Billingham to Kavarna | 1,531.07 mi (2,464.03 km) |
| Billingham to Kazanlak | 1,459.25 mi (2,348.43 km) |
| Billingham to Knezha | 1,369.02 mi (2,203.22 km) |
| Billingham to Kostinbrod | 1,370.37 mi (2,205.39 km) |
| Billingham to Kozloduy | 1,342.88 mi (2,161.15 km) |
| Billingham to Kyustendil | 1,377.78 mi (2,217.31 km) |
| Billingham to Levski | 1,413.95 mi (2,275.53 km) |
| Billingham to Lom | 1,322.74 mi (2,128.75 km) |
| Billingham to Lovech | 1,409.53 mi (2,268.42 km) |
| Billingham to Lukovit | 1,386.27 mi (2,230.99 km) |
| Billingham to Lyaskovets | 1,448.04 mi (2,330.39 km) |
| Billingham to Mezdra | 1,371.67 mi (2,207.49 km) |
| Billingham to Momchilgrad | 1,512.61 mi (2,434.30 km) |
