| Halden to Octeville | 839.43 mi (1,350.94 km) |
| Halden to Oignies | 685.89 mi (1,103.83 km) |
| Halden to Oissel | 793.67 mi (1,277.28 km) |
| Halden to Olivet | 870.16 mi (1,400.39 km) |
| Halden to Ollioules | 1,130.32 mi (1,819.07 km) |
| Halden to Olonne-sur-Mer | 1,026.83 mi (1,652.52 km) |
| Halden to Oloron-Sainte-Marie | 1,214.74 mi (1,954.93 km) |
| Halden to Onet Village | 1,086.23 mi (1,748.11 km) |
| Halden to Onnaing | 679.65 mi (1,093.79 km) |
| Halden to Orange | 1,073.10 mi (1,726.99 km) |
| Halden to Orchies | 680.76 mi (1,095.58 km) |
| Halden to Orleans | 867.56 mi (1,396.20 km) |
| Halden to Orly | 805.38 mi (1,296.13 km) |
| Halden to Ormesson-sur-Marne | 800.08 mi (1,287.60 km) |
| Halden to Orsay | 812.05 mi (1,306.87 km) |
