| McDonough to Octeville | 4,189.77 mi (6,742.79 km) |
| McDonough to Oignies | 4,364.00 mi (7,023.18 km) |
| McDonough to Oissel | 4,312.13 mi (6,939.70 km) |
| McDonough to Olivet | 4,383.02 mi (7,053.78 km) |
| McDonough to Ollioules | 4,688.85 mi (7,545.98 km) |
| McDonough to Olonne-sur-Mer | 4,253.99 mi (6,846.14 km) |
| McDonough to Oloron-Sainte-Marie | 4,390.11 mi (7,065.20 km) |
| McDonough to Onet Village | 4,505.98 mi (7,251.67 km) |
| McDonough to Onnaing | 4,390.84 mi (7,066.38 km) |
| McDonough to Orange | 4,612.51 mi (7,423.11 km) |
| McDonough to Orchies | 4,374.15 mi (7,039.52 km) |
| McDonough to Orleans | 4,382.40 mi (7,052.80 km) |
| McDonough to Orly | 4,381.89 mi (7,051.98 km) |
| McDonough to Ormesson-sur-Marne | 4,387.01 mi (7,060.21 km) |
| McDonough to Orsay | 4,374.32 mi (7,039.80 km) |
