| Iserlohn to Popovo | 1,026.55 mi (1,652.07 km) |
| Iserlohn to Provadia | 1,080.80 mi (1,739.38 km) |
| Iserlohn to Radnevo | 1,062.50 mi (1,709.92 km) |
| Iserlohn to Radomir | 941.05 mi (1,514.47 km) |
| Iserlohn to Rakitovo | 1,009.55 mi (1,624.71 km) |
| Iserlohn to Rakovski | 1,026.90 mi (1,652.64 km) |
| Iserlohn to Razgrad | 1,029.70 mi (1,657.14 km) |
| Iserlohn to Razlog | 992.60 mi (1,597.44 km) |
| Iserlohn to Ruse | 995.22 mi (1,601.65 km) |
| Iserlohn to Samokov | 973.16 mi (1,566.16 km) |
| Iserlohn to Sandanski | 1,002.17 mi (1,612.83 km) |
| Iserlohn to Sevlievo | 998.00 mi (1,606.13 km) |
| Iserlohn to Shumen | 1,056.82 mi (1,700.78 km) |
| Iserlohn to Silistra | 1,034.90 mi (1,665.51 km) |
| Iserlohn to Sliven | 1,060.08 mi (1,706.04 km) |
