| Willoughby to Devnya | 5,103.32 mi (8,213.00 km) |
| Willoughby to Dimitrovgrad | 5,083.49 mi (8,181.08 km) |
| Willoughby to Dobrich | 5,096.77 mi (8,202.46 km) |
| Willoughby to Dospat | 5,046.57 mi (8,121.67 km) |
| Willoughby to Dupnitsa | 4,978.04 mi (8,011.37 km) |
| Willoughby to Elhovo | 5,114.86 mi (8,231.57 km) |
| Willoughby to Etropole | 4,986.49 mi (8,024.98 km) |
| Willoughby to Gabrovo | 5,035.81 mi (8,104.35 km) |
| Willoughby to Gorna Oryahovitsa | 5,037.44 mi (8,106.98 km) |
| Willoughby to Gotse Delchev | 5,033.47 mi (8,100.59 km) |
| Willoughby to Harmanli | 5,100.34 mi (8,208.20 km) |
| Willoughby to Haskovo | 5,087.59 mi (8,187.69 km) |
| Willoughby to Ihtiman | 4,997.31 mi (8,042.39 km) |
| Willoughby to Isperih | 5,052.87 mi (8,131.80 km) |
| Willoughby to Kardzhali | 5,092.97 mi (8,196.34 km) |
