| Radolfzell am Bodensee to Karlovo | 845.68 mi (1,360.99 km) |
| Radolfzell am Bodensee to Karnobat | 942.74 mi (1,517.19 km) |
| Radolfzell am Bodensee to Kavarna | 979.45 mi (1,576.28 km) |
| Radolfzell am Bodensee to Kazanlak | 872.76 mi (1,404.57 km) |
| Radolfzell am Bodensee to Knezha | 785.28 mi (1,263.79 km) |
| Radolfzell am Bodensee to Kostinbrod | 770.06 mi (1,239.30 km) |
| Radolfzell am Bodensee to Kozloduy | 760.86 mi (1,224.49 km) |
| Radolfzell am Bodensee to Kyustendil | 767.03 mi (1,234.41 km) |
| Radolfzell am Bodensee to Levski | 836.42 mi (1,346.09 km) |
| Radolfzell am Bodensee to Lom | 737.40 mi (1,186.74 km) |
| Radolfzell am Bodensee to Lovech | 825.22 mi (1,328.06 km) |
| Radolfzell am Bodensee to Lukovit | 798.64 mi (1,285.28 km) |
| Radolfzell am Bodensee to Lyaskovets | 870.96 mi (1,401.67 km) |
| Radolfzell am Bodensee to Mezdra | 779.67 mi (1,254.76 km) |
| Radolfzell am Bodensee to Momchilgrad | 912.67 mi (1,468.79 km) |
