| Herndon to Karlovo | 4,990.38 mi (8,031.25 km) |
| Herndon to Karnobat | 5,078.40 mi (8,172.89 km) |
| Herndon to Kavarna | 5,097.33 mi (8,203.36 km) |
| Herndon to Kazanlak | 5,015.50 mi (8,071.67 km) |
| Herndon to Knezha | 4,925.70 mi (7,927.16 km) |
| Herndon to Kostinbrod | 4,918.46 mi (7,915.49 km) |
| Herndon to Kozloduy | 4,900.01 mi (7,885.81 km) |
| Herndon to Kyustendil | 4,918.23 mi (7,915.13 km) |
| Herndon to Levski | 4,973.43 mi (8,003.96 km) |
| Herndon to Lom | 4,878.30 mi (7,850.86 km) |
| Herndon to Lovech | 4,966.34 mi (7,992.55 km) |
| Herndon to Lukovit | 4,941.40 mi (7,952.42 km) |
| Herndon to Lyaskovets | 5,007.96 mi (8,059.53 km) |
| Herndon to Mezdra | 4,924.54 mi (7,925.28 km) |
| Herndon to Momchilgrad | 5,061.77 mi (8,146.14 km) |
