| Soure to Popovo | 1,799.83 mi (2,896.55 km) |
| Soure to Provadia | 1,861.01 mi (2,995.00 km) |
| Soure to Radnevo | 1,792.03 mi (2,883.99 km) |
| Soure to Radomir | 1,638.92 mi (2,637.58 km) |
| Soure to Rakitovo | 1,700.43 mi (2,736.57 km) |
| Soure to Rakovski | 1,742.98 mi (2,805.06 km) |
| Soure to Razgrad | 1,812.96 mi (2,917.68 km) |
| Soure to Razlog | 1,669.72 mi (2,687.16 km) |
| Soure to Ruse | 1,783.47 mi (2,870.22 km) |
| Soure to Samokov | 1,670.97 mi (2,689.17 km) |
| Soure to Sandanski | 1,662.85 mi (2,676.10 km) |
| Soure to Sevlievo | 1,745.49 mi (2,809.10 km) |
| Soure to Shumen | 1,835.29 mi (2,953.61 km) |
| Soure to Silistra | 1,846.97 mi (2,972.42 km) |
| Soure to Sliven | 1,809.28 mi (2,911.75 km) |
