| Williamsport to Devnya | 4,957.15 mi (7,977.77 km) |
| Williamsport to Dimitrovgrad | 4,931.55 mi (7,936.56 km) |
| Williamsport to Dobrich | 4,951.86 mi (7,969.24 km) |
| Williamsport to Dospat | 4,891.55 mi (7,872.19 km) |
| Williamsport to Dupnitsa | 4,822.95 mi (7,761.79 km) |
| Williamsport to Elhovo | 4,964.66 mi (7,989.85 km) |
| Williamsport to Etropole | 4,834.05 mi (7,779.65 km) |
| Williamsport to Gabrovo | 4,885.42 mi (7,862.32 km) |
| Williamsport to Gorna Oryahovitsa | 4,888.24 mi (7,866.87 km) |
| Williamsport to Gotse Delchev | 4,877.62 mi (7,849.78 km) |
| Williamsport to Harmanli | 4,948.57 mi (7,963.96 km) |
| Williamsport to Haskovo | 4,935.33 mi (7,942.64 km) |
| Williamsport to Ihtiman | 4,843.65 mi (7,795.10 km) |
| Williamsport to Isperih | 4,906.79 mi (7,896.71 km) |
| Williamsport to Kardzhali | 4,939.74 mi (7,949.74 km) |
