| Os to Popovo | 1,451.94 mi (2,336.67 km) |
| Os to Provadia | 1,491.98 mi (2,401.11 km) |
| Os to Radnevo | 1,508.36 mi (2,427.47 km) |
| Os to Radomir | 1,425.09 mi (2,293.46 km) |
| Os to Rakitovo | 1,485.27 mi (2,390.32 km) |
| Os to Rakovski | 1,486.35 mi (2,392.05 km) |
| Os to Razgrad | 1,447.96 mi (2,330.27 km) |
| Os to Razlog | 1,478.01 mi (2,378.62 km) |
| Os to Ruse | 1,416.61 mi (2,279.81 km) |
| Os to Samokov | 1,451.56 mi (2,336.06 km) |
| Os to Sandanski | 1,493.85 mi (2,404.12 km) |
| Os to Sevlievo | 1,444.57 mi (2,324.81 km) |
| Os to Shumen | 1,473.37 mi (2,371.15 km) |
| Os to Silistra | 1,432.15 mi (2,304.82 km) |
| Os to Sliven | 1,494.67 mi (2,405.44 km) |
