| Philadelphia to Popovo | 4,880.62 mi (7,854.59 km) |
| Philadelphia to Provadia | 4,935.48 mi (7,942.88 km) |
| Philadelphia to Radnevo | 4,912.51 mi (7,905.92 km) |
| Philadelphia to Radomir | 4,780.04 mi (7,692.73 km) |
| Philadelphia to Rakitovo | 4,849.93 mi (7,805.20 km) |
| Philadelphia to Rakovski | 4,873.56 mi (7,843.24 km) |
| Philadelphia to Razgrad | 4,884.25 mi (7,860.44 km) |
| Philadelphia to Razlog | 4,828.51 mi (7,770.73 km) |
| Philadelphia to Ruse | 4,849.74 mi (7,804.90 km) |
| Philadelphia to Samokov | 4,813.66 mi (7,746.84 km) |
| Philadelphia to Sandanski | 4,833.71 mi (7,779.11 km) |
| Philadelphia to Sevlievo | 4,849.05 mi (7,803.79 km) |
| Philadelphia to Shumen | 4,911.35 mi (7,904.06 km) |
| Philadelphia to Silistra | 4,889.13 mi (7,868.30 km) |
| Philadelphia to Sliven | 4,912.59 mi (7,906.05 km) |
