| Flensburg to Octeville | 587.92 mi (946.17 km) |
| Flensburg to Oignies | 401.94 mi (646.86 km) |
| Flensburg to Oissel | 515.99 mi (830.41 km) |
| Flensburg to Olivet | 577.52 mi (929.43 km) |
| Flensburg to Ollioules | 820.46 mi (1,320.40 km) |
| Flensburg to Olonne-sur-Mer | 750.28 mi (1,207.46 km) |
| Flensburg to Oloron-Sainte-Marie | 919.00 mi (1,478.98 km) |
| Flensburg to Onet Village | 781.39 mi (1,257.53 km) |
| Flensburg to Onnaing | 389.92 mi (627.52 km) |
| Flensburg to Orange | 763.77 mi (1,229.17 km) |
| Flensburg to Orchies | 394.68 mi (635.18 km) |
| Flensburg to Orleans | 575.04 mi (925.44 km) |
| Flensburg to Orly | 514.02 mi (827.23 km) |
| Flensburg to Ormesson-sur-Marne | 507.99 mi (817.53 km) |
| Flensburg to Orsay | 521.81 mi (839.77 km) |
