| Serta to Popovo | 1,778.74 mi (2,862.61 km) |
| Serta to Provadia | 1,839.83 mi (2,960.92 km) |
| Serta to Radnevo | 1,769.87 mi (2,848.33 km) |
| Serta to Radomir | 1,616.80 mi (2,601.99 km) |
| Serta to Rakitovo | 1,677.80 mi (2,700.16 km) |
| Serta to Rakovski | 1,720.73 mi (2,769.25 km) |
| Serta to Razgrad | 1,792.08 mi (2,884.07 km) |
| Serta to Razlog | 1,646.94 mi (2,650.50 km) |
| Serta to Ruse | 1,762.85 mi (2,837.04 km) |
| Serta to Samokov | 1,648.67 mi (2,653.28 km) |
| Serta to Sandanski | 1,639.73 mi (2,638.90 km) |
| Serta to Sevlievo | 1,724.01 mi (2,774.52 km) |
| Serta to Shumen | 1,814.17 mi (2,919.63 km) |
| Serta to Silistra | 1,826.72 mi (2,939.82 km) |
| Serta to Sliven | 1,787.53 mi (2,876.75 km) |
