| Koblenz to Popovo | 1,000.98 mi (1,610.92 km) |
| Koblenz to Provadia | 1,056.98 mi (1,701.05 km) |
| Koblenz to Radnevo | 1,032.71 mi (1,661.99 km) |
| Koblenz to Radomir | 905.50 mi (1,457.26 km) |
| Koblenz to Rakitovo | 974.77 mi (1,568.74 km) |
| Koblenz to Rakovski | 995.03 mi (1,601.35 km) |
| Koblenz to Razgrad | 1,005.36 mi (1,617.97 km) |
| Koblenz to Razlog | 956.12 mi (1,538.72 km) |
| Koblenz to Ruse | 970.84 mi (1,562.42 km) |
| Koblenz to Samokov | 938.32 mi (1,510.08 km) |
| Koblenz to Sandanski | 964.31 mi (1,551.91 km) |
| Koblenz to Sevlievo | 968.95 mi (1,559.38 km) |
| Koblenz to Shumen | 1,032.39 mi (1,661.47 km) |
| Koblenz to Silistra | 1,014.17 mi (1,632.15 km) |
| Koblenz to Sliven | 1,032.38 mi (1,661.46 km) |
