| Duffel to Grevena | 1,112.08 mi (1,789.71 km) |
| Duffel to Ialysos | 1,543.39 mi (2,483.85 km) |
| Duffel to Ilion | 1,299.04 mi (2,090.60 km) |
| Duffel to Ilioupoli | 1,306.09 mi (2,101.95 km) |
| Duffel to Ioannina | 1,114.52 mi (1,793.64 km) |
| Duffel to Irakleio | 1,494.31 mi (2,404.86 km) |
| Duffel to Irakleio | 1,300.48 mi (2,092.92 km) |
| Duffel to Kaisariani | 1,304.52 mi (2,099.42 km) |
| Duffel to Kalamaria | 1,141.26 mi (1,836.67 km) |
| Duffel to Kalamata | 1,299.76 mi (2,091.76 km) |
| Duffel to Kallithea | 1,303.46 mi (2,097.72 km) |
| Duffel to Kalymnos | 1,470.99 mi (2,367.33 km) |
| Duffel to Kalyvia Thorikou | 1,317.21 mi (2,119.85 km) |
| Duffel to Kamatero | 1,298.05 mi (2,089.02 km) |
| Duffel to Karditsa | 1,166.64 mi (1,877.53 km) |
