| Willebroek to Provadia | 1,206.53 mi (1,941.72 km) |
| Willebroek to Radnevo | 1,181.71 mi (1,901.78 km) |
| Willebroek to Radomir | 1,052.95 mi (1,694.56 km) |
| Willebroek to Rakitovo | 1,122.43 mi (1,806.38 km) |
| Willebroek to Rakovski | 1,143.59 mi (1,840.42 km) |
| Willebroek to Razgrad | 1,154.91 mi (1,858.64 km) |
| Willebroek to Razlog | 1,103.12 mi (1,775.31 km) |
| Willebroek to Ruse | 1,120.39 mi (1,803.09 km) |
| Willebroek to Samokov | 1,086.00 mi (1,747.75 km) |
| Willebroek to Sandanski | 1,110.68 mi (1,787.47 km) |
| Willebroek to Sevlievo | 1,118.11 mi (1,799.42 km) |
| Willebroek to Shumen | 1,181.93 mi (1,902.14 km) |
| Willebroek to Silistra | 1,163.57 mi (1,872.58 km) |
| Willebroek to Sliven | 1,181.70 mi (1,901.77 km) |
| Willebroek to Smolyan | 1,164.55 mi (1,874.15 km) |
