| Ortahisar to Octeville | 1,940.07 mi (3,122.24 km) |
| Ortahisar to Oignies | 1,751.40 mi (2,818.60 km) |
| Ortahisar to Oissel | 1,815.79 mi (2,922.23 km) |
| Ortahisar to Olivet | 1,761.46 mi (2,834.79 km) |
| Ortahisar to Ollioules | 1,539.57 mi (2,477.69 km) |
| Ortahisar to Olonne-sur-Mer | 1,923.29 mi (3,095.23 km) |
| Ortahisar to Oloron-Sainte-Marie | 1,864.68 mi (3,000.91 km) |
| Ortahisar to Onet Village | 1,704.78 mi (2,743.58 km) |
| Ortahisar to Onnaing | 1,724.26 mi (2,774.93 km) |
| Ortahisar to Orange | 1,594.48 mi (2,566.07 km) |
| Ortahisar to Orchies | 1,740.89 mi (2,801.69 km) |
| Ortahisar to Orleans | 1,761.49 mi (2,834.85 km) |
| Ortahisar to Orly | 1,749.91 mi (2,816.21 km) |
| Ortahisar to Ormesson-sur-Marne | 1,743.99 mi (2,806.68 km) |
| Ortahisar to Orsay | 1,758.48 mi (2,830.00 km) |
