| Willebroek to Orzesze | 632.83 mi (1,018.44 km) |
| Willebroek to Osowa | 632.58 mi (1,018.05 km) |
| Willebroek to Ostroda | 681.02 mi (1,096.00 km) |
| Willebroek to Ostroleka | 741.62 mi (1,193.52 km) |
| Willebroek to Ostrow Mazowiecka | 754.53 mi (1,214.30 km) |
| Willebroek to Ostrow Wielkopolski | 580.86 mi (934.81 km) |
| Willebroek to Ostrowiec Swietokrzyski | 739.04 mi (1,189.38 km) |
| Willebroek to Ostrzeszow | 586.48 mi (943.85 km) |
| Willebroek to Oswiecim | 654.85 mi (1,053.88 km) |
| Willebroek to Otwock | 727.38 mi (1,170.61 km) |
| Willebroek to Ozarow Mazowiecki | 707.54 mi (1,138.68 km) |
| Willebroek to Ozimek | 603.47 mi (971.20 km) |
| Willebroek to Ozorkow | 643.21 mi (1,035.15 km) |
| Willebroek to Pabianice | 648.00 mi (1,042.85 km) |
| Willebroek to Parczew | 797.15 mi (1,282.89 km) |
