| Didcot to Octeville | 137.87 mi (221.89 km) |
| Didcot to Oignies | 200.01 mi (321.88 km) |
| Didcot to Oissel | 187.04 mi (301.01 km) |
| Didcot to Olivet | 294.10 mi (473.30 km) |
| Didcot to Ollioules | 671.73 mi (1,081.04 km) |
| Didcot to Olonne-sur-Mer | 351.12 mi (565.07 km) |
| Didcot to Oloron-Sainte-Marie | 581.95 mi (936.56 km) |
| Didcot to Onet Village | 530.57 mi (853.87 km) |
| Didcot to Onnaing | 226.58 mi (364.65 km) |
| Didcot to Orange | 586.77 mi (944.32 km) |
| Didcot to Orchies | 209.90 mi (337.81 km) |
| Didcot to Orleans | 291.91 mi (469.78 km) |
| Didcot to Orly | 254.81 mi (410.08 km) |
| Didcot to Ormesson-sur-Marne | 256.66 mi (413.06 km) |
| Didcot to Orsay | 251.75 mi (405.15 km) |
