| Springboro to Popovo | 5,254.16 mi (8,455.76 km) |
| Springboro to Provadia | 5,306.59 mi (8,540.13 km) |
| Springboro to Radnevo | 5,291.32 mi (8,515.55 km) |
| Springboro to Radomir | 5,165.28 mi (8,312.71 km) |
| Springboro to Rakitovo | 5,234.76 mi (8,424.53 km) |
| Springboro to Rakovski | 5,254.90 mi (8,456.94 km) |
| Springboro to Razgrad | 5,256.26 mi (8,459.14 km) |
| Springboro to Razlog | 5,215.28 mi (8,393.19 km) |
| Springboro to Ruse | 5,221.95 mi (8,403.92 km) |
| Springboro to Samokov | 5,198.32 mi (8,365.88 km) |
| Springboro to Sandanski | 5,222.25 mi (8,404.40 km) |
| Springboro to Sevlievo | 5,226.87 mi (8,411.83 km) |
| Springboro to Shumen | 5,283.36 mi (8,502.74 km) |
| Springboro to Silistra | 5,256.64 mi (8,459.75 km) |
| Springboro to Sliven | 5,288.74 mi (8,511.40 km) |
