| Brussels to Orzesze | 633.59 mi (1,019.67 km) |
| Brussels to Osowa | 640.17 mi (1,030.26 km) |
| Brussels to Ostroda | 687.32 mi (1,106.14 km) |
| Brussels to Ostroleka | 746.90 mi (1,202.02 km) |
| Brussels to Ostrow Mazowiecka | 759.44 mi (1,222.20 km) |
| Brussels to Ostrow Wielkopolski | 584.10 mi (940.01 km) |
| Brussels to Ostrowiec Swietokrzyski | 741.38 mi (1,193.14 km) |
| Brussels to Ostrzeszow | 589.31 mi (948.40 km) |
| Brussels to Oswiecim | 655.53 mi (1,054.97 km) |
| Brussels to Otwock | 731.37 mi (1,177.03 km) |
| Brussels to Ozarow Mazowiecki | 711.68 mi (1,145.33 km) |
| Brussels to Ozimek | 605.03 mi (973.70 km) |
| Brussels to Ozorkow | 646.98 mi (1,041.22 km) |
| Brussels to Pabianice | 651.27 mi (1,048.11 km) |
| Brussels to Parczew | 800.55 mi (1,288.35 km) |
