| Rietberg to Popovo | 1,010.20 mi (1,625.76 km) |
| Rietberg to Provadia | 1,063.29 mi (1,711.19 km) |
| Rietberg to Radnevo | 1,048.71 mi (1,687.74 km) |
| Rietberg to Radomir | 931.37 mi (1,498.89 km) |
| Rietberg to Rakitovo | 999.18 mi (1,608.02 km) |
| Rietberg to Rakovski | 1,014.54 mi (1,632.75 km) |
| Rietberg to Razgrad | 1,012.60 mi (1,629.62 km) |
| Rietberg to Razlog | 983.44 mi (1,582.70 km) |
| Rietberg to Ruse | 978.21 mi (1,574.28 km) |
| Rietberg to Samokov | 962.92 mi (1,549.67 km) |
| Rietberg to Sandanski | 993.95 mi (1,599.60 km) |
| Rietberg to Sevlievo | 983.89 mi (1,583.41 km) |
| Rietberg to Shumen | 1,039.71 mi (1,673.26 km) |
| Rietberg to Silistra | 1,015.65 mi (1,634.53 km) |
| Rietberg to Sliven | 1,044.98 mi (1,681.73 km) |
