| Darby to Popovo | 4,889.63 mi (7,869.09 km) |
| Darby to Provadia | 4,944.49 mi (7,957.39 km) |
| Darby to Radnevo | 4,921.52 mi (7,920.42 km) |
| Darby to Radomir | 4,789.04 mi (7,707.21 km) |
| Darby to Rakitovo | 4,858.93 mi (7,819.68 km) |
| Darby to Rakovski | 4,882.57 mi (7,857.73 km) |
| Darby to Razgrad | 4,893.26 mi (7,874.94 km) |
| Darby to Razlog | 4,837.50 mi (7,785.21 km) |
| Darby to Ruse | 4,858.75 mi (7,819.41 km) |
| Darby to Samokov | 4,822.66 mi (7,761.32 km) |
| Darby to Sandanski | 4,842.71 mi (7,793.58 km) |
| Darby to Sevlievo | 4,858.06 mi (7,818.28 km) |
| Darby to Shumen | 4,920.36 mi (7,918.56 km) |
| Darby to Silistra | 4,898.14 mi (7,882.80 km) |
| Darby to Sliven | 4,921.60 mi (7,920.55 km) |
