| Bad Honnef am Rhein to Devnya | 1,083.29 mi (1,743.38 km) |
| Bad Honnef am Rhein to Dimitrovgrad | 1,053.99 mi (1,696.24 km) |
| Bad Honnef am Rhein to Dobrich | 1,080.51 mi (1,738.91 km) |
| Bad Honnef am Rhein to Dospat | 1,017.61 mi (1,637.69 km) |
| Bad Honnef am Rhein to Dupnitsa | 949.27 mi (1,527.69 km) |
| Bad Honnef am Rhein to Elhovo | 1,086.84 mi (1,749.10 km) |
| Bad Honnef am Rhein to Etropole | 956.78 mi (1,539.79 km) |
| Bad Honnef am Rhein to Gabrovo | 1,007.59 mi (1,621.55 km) |
| Bad Honnef am Rhein to Gorna Oryahovitsa | 1,010.89 mi (1,626.88 km) |
| Bad Honnef am Rhein to Gotse Delchev | 1,005.43 mi (1,618.08 km) |
| Bad Honnef am Rhein to Harmanli | 1,070.94 mi (1,723.51 km) |
| Bad Honnef am Rhein to Haskovo | 1,057.96 mi (1,702.62 km) |
| Bad Honnef am Rhein to Ihtiman | 967.61 mi (1,557.22 km) |
| Bad Honnef am Rhein to Isperih | 1,033.36 mi (1,663.03 km) |
| Bad Honnef am Rhein to Kardzhali | 1,063.18 mi (1,711.03 km) |
