| Bilthoven to Popovo | 1,143.95 mi (1,841.00 km) |
| Bilthoven to Provadia | 1,198.08 mi (1,928.12 km) |
| Bilthoven to Radnevo | 1,179.86 mi (1,898.80 km) |
| Bilthoven to Radomir | 1,057.59 mi (1,702.02 km) |
| Bilthoven to Rakitovo | 1,126.27 mi (1,812.56 km) |
| Bilthoven to Rakovski | 1,144.08 mi (1,841.21 km) |
| Bilthoven to Razgrad | 1,147.03 mi (1,845.96 km) |
| Bilthoven to Razlog | 1,108.94 mi (1,784.67 km) |
| Bilthoven to Ruse | 1,112.55 mi (1,790.48 km) |
| Bilthoven to Samokov | 1,089.86 mi (1,753.97 km) |
| Bilthoven to Sandanski | 1,118.15 mi (1,799.49 km) |
| Bilthoven to Sevlievo | 1,115.40 mi (1,795.06 km) |
| Bilthoven to Shumen | 1,174.15 mi (1,889.61 km) |
| Bilthoven to Silistra | 1,151.82 mi (1,853.68 km) |
| Bilthoven to Sliven | 1,177.51 mi (1,895.03 km) |
