| Tucson to Octeville | 5,320.89 mi (8,563.15 km) |
| Tucson to Oignies | 5,451.97 mi (8,774.10 km) |
| Tucson to Oissel | 5,431.93 mi (8,741.84 km) |
| Tucson to Olivet | 5,523.09 mi (8,888.55 km) |
| Tucson to Ollioules | 5,877.20 mi (9,458.44 km) |
| Tucson to Olonne-sur-Mer | 5,438.84 mi (8,752.97 km) |
| Tucson to Oloron-Sainte-Marie | 5,620.64 mi (9,045.54 km) |
| Tucson to Onet Village | 5,698.07 mi (9,170.15 km) |
| Tucson to Onnaing | 5,476.37 mi (8,813.37 km) |
| Tucson to Orange | 5,793.02 mi (9,322.97 km) |
| Tucson to Orchies | 5,460.42 mi (8,787.70 km) |
| Tucson to Orleans | 5,521.77 mi (8,886.43 km) |
| Tucson to Orly | 5,503.85 mi (8,857.59 km) |
| Tucson to Ormesson-sur-Marne | 5,507.31 mi (8,863.16 km) |
| Tucson to Orsay | 5,498.38 mi (8,848.79 km) |
