| Sint-Pieters-Leeuw to Oignies | 59.19 mi (95.26 km) |
| Sint-Pieters-Leeuw to Oissel | 171.86 mi (276.59 km) |
| Sint-Pieters-Leeuw to Olivet | 227.75 mi (366.52 km) |
| Sint-Pieters-Leeuw to Ollioules | 533.45 mi (858.50 km) |
| Sint-Pieters-Leeuw to Olonne-sur-Mer | 401.82 mi (646.67 km) |
| Sint-Pieters-Leeuw to Oloron-Sainte-Marie | 571.83 mi (920.27 km) |
| Sint-Pieters-Leeuw to Onet Village | 450.06 mi (724.30 km) |
| Sint-Pieters-Leeuw to Onnaing | 39.55 mi (63.66 km) |
| Sint-Pieters-Leeuw to Orange | 459.87 mi (740.08 km) |
| Sint-Pieters-Leeuw to Orchies | 48.97 mi (78.81 km) |
| Sint-Pieters-Leeuw to Orleans | 225.19 mi (362.41 km) |
| Sint-Pieters-Leeuw to Orly | 163.47 mi (263.08 km) |
| Sint-Pieters-Leeuw to Ormesson-sur-Marne | 157.72 mi (253.83 km) |
| Sint-Pieters-Leeuw to Orsay | 170.98 mi (275.16 km) |
| Sint-Pieters-Leeuw to Orthez | 556.24 mi (895.18 km) |
