| Willoughby to Octeville | 3,709.05 mi (5,969.14 km) |
| Willoughby to Oignies | 3,870.46 mi (6,228.91 km) |
| Willoughby to Oissel | 3,828.61 mi (6,161.56 km) |
| Willoughby to Olivet | 3,907.30 mi (6,288.19 km) |
| Willoughby to Ollioules | 4,234.19 mi (6,814.26 km) |
| Willoughby to Olonne-sur-Mer | 3,794.23 mi (6,106.22 km) |
| Willoughby to Oloron-Sainte-Marie | 3,951.07 mi (6,358.63 km) |
| Willoughby to Onet Village | 4,051.32 mi (6,519.97 km) |
| Willoughby to Onnaing | 3,896.79 mi (6,271.28 km) |
| Willoughby to Orange | 4,154.08 mi (6,685.35 km) |
| Willoughby to Orchies | 3,880.17 mi (6,244.54 km) |
| Willoughby to Orleans | 3,906.43 mi (6,286.79 km) |
| Willoughby to Orly | 3,899.78 mi (6,276.09 km) |
| Willoughby to Ormesson-sur-Marne | 3,904.37 mi (6,283.48 km) |
| Willoughby to Orsay | 3,892.86 mi (6,264.96 km) |
