| Duluth to Karlovo | 5,155.23 mi (8,296.54 km) |
| Duluth to Karnobat | 5,224.96 mi (8,408.76 km) |
| Duluth to Kavarna | 5,223.15 mi (8,405.84 km) |
| Duluth to Kazanlak | 5,175.69 mi (8,329.46 km) |
| Duluth to Knezha | 5,086.34 mi (8,185.67 km) |
| Duluth to Kostinbrod | 5,094.45 mi (8,198.72 km) |
| Duluth to Kozloduy | 5,060.10 mi (8,143.44 km) |
| Duluth to Kyustendil | 5,105.05 mi (8,215.79 km) |
| Duluth to Levski | 5,126.97 mi (8,251.07 km) |
| Duluth to Lom | 5,041.91 mi (8,114.17 km) |
| Duluth to Lovech | 5,126.10 mi (8,249.66 km) |
| Duluth to Lukovit | 5,104.95 mi (8,215.62 km) |
| Duluth to Lyaskovets | 5,159.79 mi (8,303.88 km) |
| Duluth to Mezdra | 5,092.54 mi (8,195.65 km) |
| Duluth to Momchilgrad | 5,234.50 mi (8,424.11 km) |
