| Watford to Devnya | 1,419.58 mi (2,284.60 km) |
| Watford to Dimitrovgrad | 1,385.56 mi (2,229.85 km) |
| Watford to Dobrich | 1,417.36 mi (2,281.02 km) |
| Watford to Dospat | 1,344.92 mi (2,164.44 km) |
| Watford to Dupnitsa | 1,276.32 mi (2,054.04 km) |
| Watford to Elhovo | 1,420.19 mi (2,285.58 km) |
| Watford to Etropole | 1,287.85 mi (2,072.60 km) |
| Watford to Gabrovo | 1,340.94 mi (2,158.03 km) |
| Watford to Gorna Oryahovitsa | 1,345.35 mi (2,165.13 km) |
| Watford to Gotse Delchev | 1,331.32 mi (2,142.55 km) |
| Watford to Harmanli | 1,402.69 mi (2,257.41 km) |
| Watford to Haskovo | 1,389.13 mi (2,235.60 km) |
| Watford to Ihtiman | 1,296.97 mi (2,087.27 km) |
| Watford to Isperih | 1,369.83 mi (2,204.53 km) |
| Watford to Kardzhali | 1,393.13 mi (2,242.03 km) |
