| Flagstaff to Octeville | 5,184.73 mi (8,344.02 km) |
| Flagstaff to Oignies | 5,308.61 mi (8,543.38 km) |
| Flagstaff to Oissel | 5,293.29 mi (8,518.72 km) |
| Flagstaff to Olivet | 5,386.86 mi (8,669.32 km) |
| Flagstaff to Ollioules | 5,746.31 mi (9,247.79 km) |
| Flagstaff to Olonne-sur-Mer | 5,310.32 mi (8,546.14 km) |
| Flagstaff to Oloron-Sainte-Marie | 5,498.78 mi (8,849.42 km) |
| Flagstaff to Onet Village | 5,568.98 mi (8,962.42 km) |
| Flagstaff to Onnaing | 5,332.50 mi (8,581.83 km) |
| Flagstaff to Orange | 5,661.39 mi (9,111.12 km) |
| Flagstaff to Orchies | 5,316.76 mi (8,556.50 km) |
| Flagstaff to Orleans | 5,385.45 mi (8,667.04 km) |
| Flagstaff to Orly | 5,365.03 mi (8,634.18 km) |
| Flagstaff to Ormesson-sur-Marne | 5,368.22 mi (8,639.32 km) |
| Flagstaff to Orsay | 5,359.91 mi (8,625.94 km) |
