| Monrovia to Popovo | 6,625.52 mi (10,662.75 km) |
| Monrovia to Provadia | 6,664.58 mi (10,725.60 km) |
| Monrovia to Radnevo | 6,681.40 mi (10,752.68 km) |
| Monrovia to Radomir | 6,589.34 mi (10,604.52 km) |
| Monrovia to Rakitovo | 6,652.84 mi (10,706.71 km) |
| Monrovia to Rakovski | 6,657.56 mi (10,714.31 km) |
| Monrovia to Razgrad | 6,621.33 mi (10,656.01 km) |
| Monrovia to Razlog | 6,642.44 mi (10,689.97 km) |
| Monrovia to Ruse | 6,590.17 mi (10,605.85 km) |
| Monrovia to Samokov | 6,617.97 mi (10,650.59 km) |
| Monrovia to Sandanski | 6,656.10 mi (10,711.96 km) |
| Monrovia to Sevlievo | 6,617.22 mi (10,649.39 km) |
| Monrovia to Shumen | 6,646.53 mi (10,696.56 km) |
| Monrovia to Silistra | 6,603.64 mi (10,627.54 km) |
| Monrovia to Sliven | 6,668.24 mi (10,731.49 km) |
