| Carbondale to Popovo | 5,531.03 mi (8,901.34 km) |
| Carbondale to Provadia | 5,582.53 mi (8,984.21 km) |
| Carbondale to Radnevo | 5,569.94 mi (8,963.96 km) |
| Carbondale to Radomir | 5,446.24 mi (8,764.87 km) |
| Carbondale to Rakitovo | 5,515.49 mi (8,876.32 km) |
| Carbondale to Rakovski | 5,534.43 mi (8,906.81 km) |
| Carbondale to Razgrad | 5,532.60 mi (8,903.85 km) |
| Carbondale to Razlog | 5,496.68 mi (8,846.05 km) |
| Carbondale to Ruse | 5,498.41 mi (8,848.84 km) |
| Carbondale to Samokov | 5,479.04 mi (8,817.66 km) |
| Carbondale to Sandanski | 5,504.21 mi (8,858.17 km) |
| Carbondale to Sevlievo | 5,505.26 mi (8,859.86 km) |
| Carbondale to Shumen | 5,559.64 mi (8,947.38 km) |
| Carbondale to Silistra | 5,531.38 mi (8,901.90 km) |
| Carbondale to Sliven | 5,566.46 mi (8,958.35 km) |
