| San Carlos to Popovo | 6,511.78 mi (10,479.69 km) |
| San Carlos to Provadia | 6,546.96 mi (10,536.32 km) |
| San Carlos to Radnevo | 6,571.34 mi (10,575.55 km) |
| San Carlos to Radomir | 6,489.35 mi (10,443.60 km) |
| San Carlos to Rakitovo | 6,550.29 mi (10,541.68 km) |
| San Carlos to Rakovski | 6,551.03 mi (10,542.86 km) |
| San Carlos to Razgrad | 6,506.13 mi (10,470.61 km) |
| San Carlos to Razlog | 6,542.39 mi (10,528.95 km) |
| San Carlos to Ruse | 6,476.24 mi (10,422.49 km) |
| San Carlos to Samokov | 6,516.38 mi (10,487.10 km) |
| San Carlos to Sandanski | 6,557.57 mi (10,553.39 km) |
| San Carlos to Sevlievo | 6,508.27 mi (10,474.05 km) |
| San Carlos to Shumen | 6,530.46 mi (10,509.76 km) |
| San Carlos to Silistra | 6,484.42 mi (10,435.66 km) |
| San Carlos to Sliven | 6,555.78 mi (10,550.51 km) |
