| Watford to Popovo | 1,358.91 mi (2,186.95 km) |
| Watford to Provadia | 1,415.31 mi (2,277.72 km) |
| Watford to Radnevo | 1,388.73 mi (2,234.94 km) |
| Watford to Radomir | 1,257.36 mi (2,023.53 km) |
| Watford to Rakitovo | 1,327.10 mi (2,135.76 km) |
| Watford to Rakovski | 1,349.75 mi (2,172.21 km) |
| Watford to Razgrad | 1,363.61 mi (2,194.52 km) |
| Watford to Razlog | 1,306.79 mi (2,103.08 km) |
| Watford to Ruse | 1,329.11 mi (2,138.99 km) |
| Watford to Samokov | 1,290.73 mi (2,077.23 km) |
| Watford to Sandanski | 1,313.38 mi (2,113.68 km) |
| Watford to Sevlievo | 1,325.49 mi (2,133.18 km) |
| Watford to Shumen | 1,390.60 mi (2,237.96 km) |
| Watford to Silistra | 1,372.82 mi (2,209.34 km) |
| Watford to Sliven | 1,389.48 mi (2,236.16 km) |
