| Willoughby to Karlovo | 5,025.98 mi (8,088.54 km) |
| Willoughby to Karnobat | 5,108.83 mi (8,221.86 km) |
| Willoughby to Kavarna | 5,121.41 mi (8,242.11 km) |
| Willoughby to Kazanlak | 5,049.80 mi (8,126.87 km) |
| Willoughby to Knezha | 4,959.59 mi (7,981.69 km) |
| Willoughby to Kostinbrod | 4,957.10 mi (7,977.69 km) |
| Willoughby to Kozloduy | 4,933.57 mi (7,939.81 km) |
| Willoughby to Kyustendil | 4,960.27 mi (7,982.78 km) |
| Willoughby to Levski | 5,005.40 mi (8,055.41 km) |
| Willoughby to Lom | 4,912.82 mi (7,906.42 km) |
| Willoughby to Lovech | 5,000.20 mi (8,047.05 km) |
| Willoughby to Lukovit | 4,976.30 mi (8,008.58 km) |
| Willoughby to Lyaskovets | 5,039.60 mi (8,110.46 km) |
| Willoughby to Mezdra | 4,960.72 mi (7,983.51 km) |
| Willoughby to Momchilgrad | 5,100.27 mi (8,208.10 km) |
