| Billdal to Popovo | 1,162.07 mi (1,870.17 km) |
| Billdal to Provadia | 1,200.55 mi (1,932.10 km) |
| Billdal to Radnevo | 1,220.41 mi (1,964.06 km) |
| Billdal to Radomir | 1,144.52 mi (1,841.93 km) |
| Billdal to Rakitovo | 1,202.27 mi (1,934.87 km) |
| Billdal to Rakovski | 1,200.55 mi (1,932.10 km) |
| Billdal to Razgrad | 1,157.43 mi (1,862.70 km) |
| Billdal to Razlog | 1,197.01 mi (1,926.41 km) |
| Billdal to Ruse | 1,126.61 mi (1,813.11 km) |
| Billdal to Samokov | 1,169.49 mi (1,882.11 km) |
| Billdal to Sandanski | 1,214.00 mi (1,953.75 km) |
| Billdal to Sevlievo | 1,157.31 mi (1,862.50 km) |
| Billdal to Shumen | 1,182.50 mi (1,903.05 km) |
| Billdal to Silistra | 1,140.05 mi (1,834.73 km) |
| Billdal to Sliven | 1,205.46 mi (1,940.00 km) |
