| Harrow on the Hill to Devnya | 1,415.55 mi (2,278.11 km) |
| Harrow on the Hill to Dimitrovgrad | 1,381.06 mi (2,222.59 km) |
| Harrow on the Hill to Dobrich | 1,413.44 mi (2,274.70 km) |
| Harrow on the Hill to Dospat | 1,340.17 mi (2,156.79 km) |
| Harrow on the Hill to Dupnitsa | 1,271.57 mi (2,046.39 km) |
| Harrow on the Hill to Elhovo | 1,415.82 mi (2,278.55 km) |
| Harrow on the Hill to Etropole | 1,283.32 mi (2,065.31 km) |
| Harrow on the Hill to Gabrovo | 1,336.57 mi (2,151.01 km) |
| Harrow on the Hill to Gorna Oryahovitsa | 1,341.09 mi (2,158.27 km) |
| Harrow on the Hill to Gotse Delchev | 1,326.49 mi (2,134.79 km) |
| Harrow on the Hill to Harmanli | 1,398.19 mi (2,250.18 km) |
| Harrow on the Hill to Haskovo | 1,384.60 mi (2,228.30 km) |
| Harrow on the Hill to Ihtiman | 1,292.33 mi (2,079.81 km) |
| Harrow on the Hill to Isperih | 1,365.83 mi (2,198.10 km) |
| Harrow on the Hill to Kardzhali | 1,388.52 mi (2,234.60 km) |
