| Portsmouth to Karlovo | 1,340.69 mi (2,157.63 km) |
| Portsmouth to Karnobat | 1,433.47 mi (2,306.94 km) |
| Portsmouth to Kavarna | 1,462.29 mi (2,353.32 km) |
| Portsmouth to Kazanlak | 1,366.79 mi (2,199.63 km) |
| Portsmouth to Knezha | 1,277.84 mi (2,056.48 km) |
| Portsmouth to Kostinbrod | 1,267.10 mi (2,039.19 km) |
| Portsmouth to Kozloduy | 1,252.65 mi (2,015.95 km) |
| Portsmouth to Kyustendil | 1,266.04 mi (2,037.50 km) |
| Portsmouth to Levski | 1,327.39 mi (2,136.23 km) |
| Portsmouth to Lom | 1,230.06 mi (1,979.59 km) |
| Portsmouth to Lovech | 1,318.27 mi (2,121.55 km) |
| Portsmouth to Lukovit | 1,292.49 mi (2,080.07 km) |
| Portsmouth to Lyaskovets | 1,362.06 mi (2,192.03 km) |
| Portsmouth to Mezdra | 1,274.65 mi (2,051.34 km) |
| Portsmouth to Momchilgrad | 1,410.25 mi (2,269.57 km) |
