| Donegal to Devnya | 1,776.25 mi (2,858.60 km) |
| Donegal to Dimitrovgrad | 1,751.87 mi (2,819.37 km) |
| Donegal to Dobrich | 1,771.62 mi (2,851.14 km) |
| Donegal to Dospat | 1,715.58 mi (2,760.95 km) |
| Donegal to Dupnitsa | 1,647.15 mi (2,650.83 km) |
| Donegal to Elhovo | 1,783.87 mi (2,870.86 km) |
| Donegal to Etropole | 1,654.82 mi (2,663.17 km) |
| Donegal to Gabrovo | 1,704.70 mi (2,743.45 km) |
| Donegal to Gorna Oryahovitsa | 1,707.09 mi (2,747.30 km) |
| Donegal to Gotse Delchev | 1,703.06 mi (2,740.81 km) |
| Donegal to Harmanli | 1,768.76 mi (2,846.54 km) |
| Donegal to Haskovo | 1,755.94 mi (2,825.91 km) |
| Donegal to Ihtiman | 1,665.78 mi (2,680.82 km) |
| Donegal to Isperih | 1,725.96 mi (2,777.66 km) |
| Donegal to Kardzhali | 1,761.34 mi (2,834.60 km) |
