| Sligo to Popovo | 1,727.39 mi (2,779.96 km) |
| Sligo to Provadia | 1,782.02 mi (2,867.88 km) |
| Sligo to Radnevo | 1,761.24 mi (2,834.44 km) |
| Sligo to Radomir | 1,633.93 mi (2,629.56 km) |
| Sligo to Rakitovo | 1,703.37 mi (2,741.31 km) |
| Sligo to Rakovski | 1,723.92 mi (2,774.37 km) |
| Sligo to Razgrad | 1,730.83 mi (2,785.50 km) |
| Sligo to Razlog | 1,684.12 mi (2,710.34 km) |
| Sligo to Ruse | 1,696.33 mi (2,729.97 km) |
| Sligo to Samokov | 1,666.93 mi (2,682.67 km) |
| Sligo to Sandanski | 1,691.55 mi (2,722.29 km) |
| Sligo to Sevlievo | 1,697.22 mi (2,731.41 km) |
| Sligo to Shumen | 1,757.94 mi (2,829.13 km) |
| Sligo to Silistra | 1,736.05 mi (2,793.90 km) |
| Sligo to Sliven | 1,760.10 mi (2,832.60 km) |
