| Diest to Oignies | 96.79 mi (155.77 km) |
| Diest to Oissel | 208.77 mi (335.99 km) |
| Diest to Olivet | 257.91 mi (415.07 km) |
| Diest to Ollioules | 543.34 mi (874.42 km) |
| Diest to Olonne-sur-Mer | 436.79 mi (702.94 km) |
| Diest to Oloron-Sainte-Marie | 600.05 mi (965.69 km) |
| Diest to Onet Village | 471.34 mi (758.55 km) |
| Diest to Onnaing | 75.81 mi (122.01 km) |
| Diest to Orange | 473.17 mi (761.50 km) |
| Diest to Orchies | 86.53 mi (139.26 km) |
| Diest to Orleans | 255.45 mi (411.10 km) |
| Diest to Orly | 194.88 mi (313.64 km) |
| Diest to Ormesson-sur-Marne | 188.65 mi (303.61 km) |
| Diest to Orsay | 203.06 mi (326.79 km) |
| Diest to Orthez | 585.13 mi (941.67 km) |
