| Idstein to Popovo | 969.70 mi (1,560.58 km) |
| Idstein to Provadia | 1,025.65 mi (1,650.62 km) |
| Idstein to Radnevo | 1,001.66 mi (1,612.01 km) |
| Idstein to Radomir | 874.98 mi (1,408.14 km) |
| Idstein to Rakitovo | 944.17 mi (1,519.50 km) |
| Idstein to Rakovski | 964.14 mi (1,551.63 km) |
| Idstein to Razgrad | 974.04 mi (1,567.57 km) |
| Idstein to Razlog | 925.73 mi (1,489.81 km) |
| Idstein to Ruse | 939.52 mi (1,512.02 km) |
| Idstein to Samokov | 907.72 mi (1,460.84 km) |
| Idstein to Sandanski | 934.11 mi (1,503.31 km) |
| Idstein to Sevlievo | 937.84 mi (1,509.31 km) |
| Idstein to Shumen | 1,001.07 mi (1,611.07 km) |
| Idstein to Silistra | 982.80 mi (1,581.67 km) |
| Idstein to Sliven | 1,001.20 mi (1,611.27 km) |
