| Seattle to Octeville | 4,845.08 mi (7,797.41 km) |
| Seattle to Oignies | 4,921.69 mi (7,920.69 km) |
| Seattle to Oissel | 4,935.02 mi (7,942.15 km) |
| Seattle to Olivet | 5,039.35 mi (8,110.05 km) |
| Seattle to Ollioules | 5,416.64 mi (8,717.24 km) |
| Seattle to Olonne-sur-Mer | 5,010.24 mi (8,063.21 km) |
| Seattle to Oloron-Sainte-Marie | 5,229.21 mi (8,415.61 km) |
| Seattle to Onet Village | 5,256.04 mi (8,458.78 km) |
| Seattle to Onnaing | 4,941.66 mi (7,952.83 km) |
| Seattle to Orange | 5,330.50 mi (8,578.61 km) |
| Seattle to Orchies | 4,927.77 mi (7,930.47 km) |
| Seattle to Orleans | 5,037.41 mi (8,106.93 km) |
| Seattle to Orly | 5,003.08 mi (8,051.68 km) |
| Seattle to Ormesson-sur-Marne | 5,004.57 mi (8,054.08 km) |
| Seattle to Orsay | 5,000.20 mi (8,047.05 km) |
