| Seraing to Provadia | 1,149.20 mi (1,849.47 km) |
| Seraing to Radnevo | 1,123.21 mi (1,807.64 km) |
| Seraing to Radomir | 993.72 mi (1,599.24 km) |
| Seraing to Rakitovo | 1,063.26 mi (1,711.15 km) |
| Seraing to Rakovski | 1,084.78 mi (1,745.79 km) |
| Seraing to Razgrad | 1,097.49 mi (1,766.25 km) |
| Seraing to Razlog | 1,043.78 mi (1,679.80 km) |
| Seraing to Ruse | 1,062.99 mi (1,710.72 km) |
| Seraing to Samokov | 1,026.83 mi (1,652.53 km) |
| Seraing to Sandanski | 1,051.21 mi (1,691.76 km) |
| Seraing to Sevlievo | 1,059.77 mi (1,705.54 km) |
| Seraing to Shumen | 1,124.49 mi (1,809.68 km) |
| Seraing to Silistra | 1,107.02 mi (1,781.57 km) |
| Seraing to Sliven | 1,123.58 mi (1,808.23 km) |
| Seraing to Smolyan | 1,105.37 mi (1,778.92 km) |
