| Sonderborg to Popovo | 1,085.94 mi (1,747.66 km) |
| Sonderborg to Provadia | 1,131.86 mi (1,821.55 km) |
| Sonderborg to Radnevo | 1,136.06 mi (1,828.31 km) |
| Sonderborg to Radomir | 1,039.99 mi (1,673.70 km) |
| Sonderborg to Rakitovo | 1,103.22 mi (1,775.46 km) |
| Sonderborg to Rakovski | 1,109.30 mi (1,785.25 km) |
| Sonderborg to Razgrad | 1,084.48 mi (1,745.31 km) |
| Sonderborg to Razlog | 1,093.10 mi (1,759.18 km) |
| Sonderborg to Ruse | 1,051.46 mi (1,692.16 km) |
| Sonderborg to Samokov | 1,068.35 mi (1,719.34 km) |
| Sonderborg to Sandanski | 1,107.38 mi (1,782.16 km) |
| Sonderborg to Sevlievo | 1,071.14 mi (1,723.84 km) |
| Sonderborg to Shumen | 1,110.94 mi (1,787.88 km) |
| Sonderborg to Silistra | 1,076.31 mi (1,732.16 km) |
| Sonderborg to Sliven | 1,126.06 mi (1,812.22 km) |
