| Hartlepool to Karlovo | 1,436.38 mi (2,311.64 km) |
| Hartlepool to Karnobat | 1,516.81 mi (2,441.06 km) |
| Hartlepool to Kavarna | 1,530.51 mi (2,463.13 km) |
| Hartlepool to Kazanlak | 1,459.27 mi (2,348.47 km) |
| Hartlepool to Knezha | 1,369.05 mi (2,203.27 km) |
| Hartlepool to Kostinbrod | 1,370.69 mi (2,205.90 km) |
| Hartlepool to Kozloduy | 1,342.90 mi (2,161.19 km) |
| Hartlepool to Kyustendil | 1,378.30 mi (2,218.15 km) |
| Hartlepool to Levski | 1,413.85 mi (2,275.37 km) |
| Hartlepool to Lom | 1,322.83 mi (2,128.89 km) |
| Hartlepool to Lovech | 1,409.54 mi (2,268.44 km) |
| Hartlepool to Lukovit | 1,386.36 mi (2,231.13 km) |
| Hartlepool to Lyaskovets | 1,447.91 mi (2,330.19 km) |
| Hartlepool to Mezdra | 1,371.84 mi (2,207.76 km) |
| Hartlepool to Momchilgrad | 1,512.85 mi (2,434.69 km) |
