| Drogheda to Popovo | 1,634.78 mi (2,630.93 km) |
| Drogheda to Provadia | 1,689.75 mi (2,719.39 km) |
| Drogheda to Radnevo | 1,667.94 mi (2,684.29 km) |
| Drogheda to Radomir | 1,539.94 mi (2,478.30 km) |
| Drogheda to Rakitovo | 1,609.44 mi (2,590.14 km) |
| Drogheda to Rakovski | 1,630.33 mi (2,623.76 km) |
| Drogheda to Razgrad | 1,638.45 mi (2,636.82 km) |
| Drogheda to Razlog | 1,590.02 mi (2,558.90 km) |
| Drogheda to Ruse | 1,603.93 mi (2,581.28 km) |
| Drogheda to Samokov | 1,573.01 mi (2,531.51 km) |
| Drogheda to Sandanski | 1,597.33 mi (2,570.66 km) |
| Drogheda to Sevlievo | 1,604.04 mi (2,581.45 km) |
| Drogheda to Shumen | 1,665.55 mi (2,680.44 km) |
| Drogheda to Silistra | 1,644.39 mi (2,646.39 km) |
| Drogheda to Sliven | 1,667.12 mi (2,682.98 km) |
