| Idar-Oberstein to Popovo | 997.26 mi (1,604.94 km) |
| Idar-Oberstein to Provadia | 1,054.36 mi (1,696.83 km) |
| Idar-Oberstein to Radnevo | 1,025.87 mi (1,650.98 km) |
| Idar-Oberstein to Radomir | 894.72 mi (1,439.92 km) |
| Idar-Oberstein to Rakitovo | 964.38 mi (1,552.02 km) |
| Idar-Oberstein to Rakovski | 986.76 mi (1,588.04 km) |
| Idar-Oberstein to Razgrad | 1,002.51 mi (1,613.38 km) |
| Idar-Oberstein to Razlog | 944.49 mi (1,520.00 km) |
| Idar-Oberstein to Ruse | 968.06 mi (1,557.94 km) |
| Idar-Oberstein to Samokov | 927.98 mi (1,493.44 km) |
| Idar-Oberstein to Sandanski | 951.61 mi (1,531.47 km) |
| Idar-Oberstein to Sevlievo | 962.82 mi (1,549.50 km) |
| Idar-Oberstein to Shumen | 1,029.40 mi (1,656.66 km) |
| Idar-Oberstein to Silistra | 1,013.83 mi (1,631.60 km) |
| Idar-Oberstein to Sliven | 1,027.06 mi (1,652.89 km) |
