| Duffel to Dimitrovgrad | 1,174.16 mi (1,889.62 km) |
| Duffel to Dobrich | 1,202.63 mi (1,935.45 km) |
| Duffel to Dospat | 1,136.08 mi (1,828.34 km) |
| Duffel to Dupnitsa | 1,067.58 mi (1,718.11 km) |
| Duffel to Elhovo | 1,207.70 mi (1,943.61 km) |
| Duffel to Etropole | 1,076.71 mi (1,732.80 km) |
| Duffel to Gabrovo | 1,128.43 mi (1,816.03 km) |
| Duffel to Gorna Oryahovitsa | 1,132.16 mi (1,822.03 km) |
| Duffel to Gotse Delchev | 1,123.32 mi (1,807.80 km) |
| Duffel to Harmanli | 1,191.18 mi (1,917.02 km) |
| Duffel to Haskovo | 1,177.97 mi (1,895.76 km) |
| Duffel to Ihtiman | 1,086.87 mi (1,749.14 km) |
| Duffel to Isperih | 1,155.36 mi (1,859.37 km) |
| Duffel to Kardzhali | 1,182.72 mi (1,903.40 km) |
| Duffel to Karlovo | 1,116.89 mi (1,797.46 km) |
