| Duffel to Karnobat | 1,204.91 mi (1,939.11 km) |
| Duffel to Kavarna | 1,228.58 mi (1,977.21 km) |
| Duffel to Kazanlak | 1,141.68 mi (1,837.36 km) |
| Duffel to Knezha | 1,051.81 mi (1,692.72 km) |
| Duffel to Kostinbrod | 1,046.67 mi (1,684.45 km) |
| Duffel to Kozloduy | 1,026.09 mi (1,651.34 km) |
| Duffel to Kyustendil | 1,050.07 mi (1,689.93 km) |
| Duffel to Levski | 1,099.63 mi (1,769.68 km) |
| Duffel to Lom | 1,004.46 mi (1,616.53 km) |
| Duffel to Lovech | 1,092.45 mi (1,758.12 km) |
| Duffel to Lukovit | 1,067.67 mi (1,718.25 km) |
| Duffel to Lyaskovets | 1,134.20 mi (1,825.32 km) |
| Duffel to Mezdra | 1,051.23 mi (1,691.79 km) |
| Duffel to Momchilgrad | 1,189.94 mi (1,915.02 km) |
| Duffel to Montana | 1,021.32 mi (1,643.65 km) |
