| Bad Honnef am Rhein to Popovo | 1,023.46 mi (1,647.11 km) |
| Bad Honnef am Rhein to Provadia | 1,079.15 mi (1,736.73 km) |
| Bad Honnef am Rhein to Radnevo | 1,055.95 mi (1,699.38 km) |
| Bad Honnef am Rhein to Radomir | 929.59 mi (1,496.03 km) |
| Bad Honnef am Rhein to Rakitovo | 998.77 mi (1,607.37 km) |
| Bad Honnef am Rhein to Rakovski | 1,018.60 mi (1,639.28 km) |
| Bad Honnef am Rhein to Razgrad | 1,027.62 mi (1,653.79 km) |
| Bad Honnef am Rhein to Razlog | 980.35 mi (1,577.73 km) |
| Bad Honnef am Rhein to Ruse | 993.09 mi (1,598.23 km) |
| Bad Honnef am Rhein to Samokov | 962.32 mi (1,548.71 km) |
| Bad Honnef am Rhein to Sandanski | 988.73 mi (1,591.21 km) |
| Bad Honnef am Rhein to Sevlievo | 992.05 mi (1,596.55 km) |
| Bad Honnef am Rhein to Shumen | 1,054.67 mi (1,697.33 km) |
| Bad Honnef am Rhein to Silistra | 1,035.72 mi (1,666.83 km) |
| Bad Honnef am Rhein to Sliven | 1,055.26 mi (1,698.28 km) |
