| Heerlen to Octeville | 347.73 mi (559.62 km) |
| Heerlen to Oignies | 133.98 mi (215.62 km) |
| Heerlen to Oissel | 241.44 mi (388.55 km) |
| Heerlen to Olivet | 277.87 mi (447.19 km) |
| Heerlen to Ollioules | 535.09 mi (861.14 km) |
| Heerlen to Olonne-sur-Mer | 463.54 mi (745.99 km) |
| Heerlen to Oloron-Sainte-Marie | 614.68 mi (989.23 km) |
| Heerlen to Onet Village | 477.06 mi (767.75 km) |
| Heerlen to Onnaing | 109.98 mi (177.00 km) |
| Heerlen to Orange | 469.22 mi (755.14 km) |
| Heerlen to Orchies | 123.19 mi (198.26 km) |
| Heerlen to Orleans | 275.57 mi (443.49 km) |
| Heerlen to Orly | 217.84 mi (350.58 km) |
| Heerlen to Ormesson-sur-Marne | 211.08 mi (339.70 km) |
| Heerlen to Orsay | 226.80 mi (365.00 km) |
