| Alpena to Karlovo | 4,941.51 mi (7,952.60 km) |
| Alpena to Karnobat | 5,019.48 mi (8,078.07 km) |
| Alpena to Kavarna | 5,026.52 mi (8,089.40 km) |
| Alpena to Kazanlak | 4,964.08 mi (7,988.92 km) |
| Alpena to Knezha | 4,873.92 mi (7,843.81 km) |
| Alpena to Kostinbrod | 4,875.62 mi (7,846.55 km) |
| Alpena to Kozloduy | 4,847.72 mi (7,801.66 km) |
| Alpena to Kyustendil | 4,881.76 mi (7,856.44 km) |
| Alpena to Levski | 4,917.84 mi (7,914.50 km) |
| Alpena to Lom | 4,827.92 mi (7,769.78 km) |
| Alpena to Lovech | 4,914.33 mi (7,908.85 km) |
| Alpena to Lukovit | 4,891.43 mi (7,872.00 km) |
| Alpena to Lyaskovets | 4,951.61 mi (7,968.85 km) |
| Alpena to Mezdra | 4,877.06 mi (7,848.86 km) |
| Alpena to Momchilgrad | 5,018.01 mi (8,075.71 km) |
