| Drexel Heights to Popovo | 6,563.68 mi (10,563.23 km) |
| Drexel Heights to Provadia | 6,607.58 mi (10,633.86 km) |
| Drexel Heights to Radnevo | 6,614.06 mi (10,644.30 km) |
| Drexel Heights to Radomir | 6,509.54 mi (10,476.10 km) |
| Drexel Heights to Rakitovo | 6,575.78 mi (10,582.70 km) |
| Drexel Heights to Rakovski | 6,585.75 mi (10,598.73 km) |
| Drexel Heights to Razgrad | 6,561.50 mi (10,559.71 km) |
| Drexel Heights to Razlog | 6,562.19 mi (10,560.82 km) |
| Drexel Heights to Ruse | 6,528.93 mi (10,507.29 km) |
| Drexel Heights to Samokov | 6,539.98 mi (10,525.09 km) |
| Drexel Heights to Sandanski | 6,573.72 mi (10,579.38 km) |
| Drexel Heights to Sevlievo | 6,549.03 mi (10,539.65 km) |
| Drexel Heights to Shumen | 6,587.62 mi (10,601.75 km) |
| Drexel Heights to Silistra | 6,549.44 mi (10,540.31 km) |
| Drexel Heights to Sliven | 6,604.24 mi (10,628.50 km) |
