| Socorro to Popovo | 6,448.62 mi (10,378.05 km) |
| Socorro to Provadia | 6,495.24 mi (10,453.08 km) |
| Socorro to Radnevo | 6,495.34 mi (10,453.24 km) |
| Socorro to Radomir | 6,383.81 mi (10,273.75 km) |
| Socorro to Rakitovo | 6,451.35 mi (10,382.45 km) |
| Socorro to Rakovski | 6,464.45 mi (10,403.53 km) |
| Socorro to Razgrad | 6,447.68 mi (10,376.53 km) |
| Socorro to Razlog | 6,435.89 mi (10,357.57 km) |
| Socorro to Ruse | 6,414.42 mi (10,323.02 km) |
| Socorro to Samokov | 6,415.19 mi (10,324.25 km) |
| Socorro to Sandanski | 6,446.07 mi (10,373.95 km) |
| Socorro to Sevlievo | 6,430.15 mi (10,348.33 km) |
| Socorro to Shumen | 6,474.22 mi (10,419.25 km) |
| Socorro to Silistra | 6,439.16 mi (10,362.83 km) |
| Socorro to Sliven | 6,487.62 mi (10,440.82 km) |
