| Casper to Karlovo | 5,798.43 mi (9,331.67 km) |
| Casper to Karnobat | 5,859.38 mi (9,429.76 km) |
| Casper to Kavarna | 5,848.63 mi (9,412.46 km) |
| Casper to Kazanlak | 5,816.64 mi (9,360.97 km) |
| Casper to Knezha | 5,728.94 mi (9,219.84 km) |
| Casper to Kostinbrod | 5,743.13 mi (9,242.68 km) |
| Casper to Kozloduy | 5,702.91 mi (9,177.94 km) |
| Casper to Kyustendil | 5,757.85 mi (9,266.37 km) |
| Casper to Levski | 5,765.98 mi (9,279.44 km) |
| Casper to Lom | 5,686.45 mi (9,151.46 km) |
| Casper to Lovech | 5,767.69 mi (9,282.21 km) |
| Casper to Lukovit | 5,748.44 mi (9,251.22 km) |
| Casper to Lyaskovets | 5,797.53 mi (9,330.22 km) |
| Casper to Mezdra | 5,738.04 mi (9,234.48 km) |
| Casper to Momchilgrad | 5,879.64 mi (9,462.37 km) |
