| Sint-Pieters-Leeuw to Oestrich-Winkel | 173.80 mi (279.71 km) |
| Sint-Pieters-Leeuw to Offenburg | 229.72 mi (369.70 km) |
| Sint-Pieters-Leeuw to Oftersheim | 215.52 mi (346.85 km) |
| Sint-Pieters-Leeuw to Ohrdruf | 282.99 mi (455.43 km) |
| Sint-Pieters-Leeuw to Ohringen | 257.51 mi (414.42 km) |
| Sint-Pieters-Leeuw to Olbernhau | 397.13 mi (639.11 km) |
| Sint-Pieters-Leeuw to Olching | 363.71 mi (585.33 km) |
| Sint-Pieters-Leeuw to Oldenburg | 234.63 mi (377.59 km) |
| Sint-Pieters-Leeuw to Oldenburg in Holstein | 369.50 mi (594.66 km) |
| Sint-Pieters-Leeuw to Olfen | 150.05 mi (241.49 km) |
| Sint-Pieters-Leeuw to Olpe | 156.96 mi (252.60 km) |
| Sint-Pieters-Leeuw to Olsberg | 187.90 mi (302.40 km) |
| Sint-Pieters-Leeuw to Oranienburg | 407.34 mi (655.56 km) |
| Sint-Pieters-Leeuw to Ortenberg | 212.90 mi (342.62 km) |
| Sint-Pieters-Leeuw to Oschatz | 386.20 mi (621.52 km) |
