| Duffel to Orzesze | 626.33 mi (1,007.98 km) |
| Duffel to Osowa | 625.74 mi (1,007.03 km) |
| Duffel to Ostroda | 674.12 mi (1,084.89 km) |
| Duffel to Ostroleka | 734.72 mi (1,182.42 km) |
| Duffel to Ostrow Mazowiecka | 747.64 mi (1,203.20 km) |
| Duffel to Ostrow Wielkopolski | 574.07 mi (923.88 km) |
| Duffel to Ostrowiec Swietokrzyski | 732.33 mi (1,178.58 km) |
| Duffel to Ostrzeszow | 579.73 mi (932.98 km) |
| Duffel to Oswiecim | 648.36 mi (1,043.44 km) |
| Duffel to Otwock | 720.53 mi (1,159.58 km) |
| Duffel to Ozarow Mazowiecki | 700.68 mi (1,127.64 km) |
| Duffel to Ozimek | 596.86 mi (960.56 km) |
| Duffel to Ozorkow | 636.38 mi (1,024.15 km) |
| Duffel to Pabianice | 641.20 mi (1,031.91 km) |
| Duffel to Parczew | 790.34 mi (1,271.93 km) |
