| Boise to Karlovo | 6,008.55 mi (9,669.83 km) |
| Boise to Karnobat | 6,058.42 mi (9,750.08 km) |
| Boise to Kavarna | 6,037.57 mi (9,716.52 km) |
| Boise to Kazanlak | 6,023.86 mi (9,694.47 km) |
| Boise to Knezha | 5,939.21 mi (9,558.23 km) |
| Boise to Kostinbrod | 5,960.51 mi (9,592.51 km) |
| Boise to Kozloduy | 5,913.74 mi (9,517.25 km) |
| Boise to Kyustendil | 5,980.08 mi (9,624.01 km) |
| Boise to Levski | 5,971.54 mi (9,610.27 km) |
| Boise to Lom | 5,899.55 mi (9,494.40 km) |
| Boise to Lovech | 5,976.29 mi (9,617.90 km) |
| Boise to Lukovit | 5,959.52 mi (9,590.92 km) |
| Boise to Lyaskovets | 6,001.21 mi (9,658.02 km) |
| Boise to Mezdra | 5,951.65 mi (9,578.25 km) |
| Boise to Momchilgrad | 6,091.10 mi (9,802.68 km) |
