| Drexel Hill to Popovo | 4,890.04 mi (7,869.77 km) |
| Drexel Hill to Provadia | 4,944.89 mi (7,958.02 km) |
| Drexel Hill to Radnevo | 4,921.99 mi (7,921.18 km) |
| Drexel Hill to Radomir | 4,789.57 mi (7,708.07 km) |
| Drexel Hill to Rakitovo | 4,859.46 mi (7,820.54 km) |
| Drexel Hill to Rakovski | 4,883.06 mi (7,858.53 km) |
| Drexel Hill to Razgrad | 4,893.66 mi (7,875.59 km) |
| Drexel Hill to Razlog | 4,838.06 mi (7,786.10 km) |
| Drexel Hill to Ruse | 4,859.16 mi (7,820.06 km) |
| Drexel Hill to Samokov | 4,823.19 mi (7,762.17 km) |
| Drexel Hill to Sandanski | 4,843.28 mi (7,794.50 km) |
| Drexel Hill to Sevlievo | 4,858.52 mi (7,819.03 km) |
| Drexel Hill to Shumen | 4,920.77 mi (7,919.21 km) |
| Drexel Hill to Silistra | 4,898.50 mi (7,883.38 km) |
| Drexel Hill to Sliven | 4,922.05 mi (7,921.27 km) |
