| Philadelphia to Devnya | 4,939.36 mi (7,949.12 km) |
| Philadelphia to Dimitrovgrad | 4,909.42 mi (7,900.94 km) |
| Philadelphia to Dobrich | 4,935.00 mi (7,942.12 km) |
| Philadelphia to Dospat | 4,867.10 mi (7,832.84 km) |
| Philadelphia to Dupnitsa | 4,798.54 mi (7,722.51 km) |
| Philadelphia to Elhovo | 4,943.81 mi (7,956.29 km) |
| Philadelphia to Etropole | 4,811.67 mi (7,743.64 km) |
| Philadelphia to Gabrovo | 4,864.54 mi (7,828.71 km) |
| Philadelphia to Gorna Oryahovitsa | 4,868.26 mi (7,834.71 km) |
| Philadelphia to Gotse Delchev | 4,852.55 mi (7,809.42 km) |
| Philadelphia to Harmanli | 4,926.55 mi (7,928.52 km) |
| Philadelphia to Haskovo | 4,912.94 mi (7,906.62 km) |
| Philadelphia to Ihtiman | 4,820.32 mi (7,757.55 km) |
| Philadelphia to Isperih | 4,889.13 mi (7,868.29 km) |
| Philadelphia to Kardzhali | 4,916.60 mi (7,912.51 km) |
