| Radolfzell am Bodensee to Popovo | 886.45 mi (1,426.61 km) |
| Radolfzell am Bodensee to Provadia | 945.80 mi (1,522.12 km) |
| Radolfzell am Bodensee to Radnevo | 907.23 mi (1,460.05 km) |
| Radolfzell am Bodensee to Radomir | 768.27 mi (1,236.41 km) |
| Radolfzell am Bodensee to Rakitovo | 838.19 mi (1,348.94 km) |
| Radolfzell am Bodensee to Rakovski | 865.12 mi (1,392.28 km) |
| Radolfzell am Bodensee to Razgrad | 893.83 mi (1,438.48 km) |
| Radolfzell am Bodensee to Razlog | 815.79 mi (1,312.88 km) |
| Radolfzell am Bodensee to Ruse | 859.92 mi (1,383.91 km) |
| Radolfzell am Bodensee to Samokov | 802.20 mi (1,291.01 km) |
| Radolfzell am Bodensee to Sandanski | 820.63 mi (1,320.68 km) |
| Radolfzell am Bodensee to Sevlievo | 846.40 mi (1,362.15 km) |
| Radolfzell am Bodensee to Shumen | 920.13 mi (1,480.81 km) |
| Radolfzell am Bodensee to Silistra | 911.58 mi (1,467.05 km) |
| Radolfzell am Bodensee to Sliven | 912.02 mi (1,467.75 km) |
