| Frederick to Karlovo | 4,970.50 mi (7,999.25 km) |
| Frederick to Karnobat | 5,058.07 mi (8,140.18 km) |
| Frederick to Kavarna | 5,076.45 mi (8,169.75 km) |
| Frederick to Kazanlak | 4,995.51 mi (8,039.50 km) |
| Frederick to Knezha | 4,905.65 mi (7,894.89 km) |
| Frederick to Kostinbrod | 4,898.83 mi (7,883.91 km) |
| Frederick to Kozloduy | 4,879.92 mi (7,853.48 km) |
| Frederick to Kyustendil | 4,898.92 mi (7,884.05 km) |
| Frederick to Levski | 4,953.22 mi (7,971.43 km) |
| Frederick to Lom | 4,858.29 mi (7,818.67 km) |
| Frederick to Lovech | 4,946.29 mi (7,960.29 km) |
| Frederick to Lukovit | 4,921.45 mi (7,920.30 km) |
| Frederick to Lyaskovets | 4,987.73 mi (8,026.97 km) |
| Frederick to Mezdra | 4,904.70 mi (7,893.35 km) |
| Frederick to Momchilgrad | 5,042.17 mi (8,114.59 km) |
