| Willoughby to Orbetello | 4,488.48 mi (7,223.51 km) |
| Willoughby to Oria | 4,835.45 mi (7,781.91 km) |
| Willoughby to Oristano | 4,474.92 mi (7,201.69 km) |
| Willoughby to Orta Nova | 4,720.95 mi (7,597.63 km) |
| Willoughby to Orte | 4,536.78 mi (7,301.25 km) |
| Willoughby to Ortona | 4,624.77 mi (7,442.85 km) |
| Willoughby to Orvieto | 4,515.07 mi (7,266.30 km) |
| Willoughby to Orzinuovi | 4,322.24 mi (6,955.97 km) |
| Willoughby to Osimo | 4,541.43 mi (7,308.73 km) |
| Willoughby to Ospitaletto | 4,322.15 mi (6,955.83 km) |
| Willoughby to Ostuni | 4,823.42 mi (7,762.55 km) |
| Willoughby to Ottaviano | 4,689.45 mi (7,546.95 km) |
| Willoughby to Ovada | 4,297.48 mi (6,916.13 km) |
| Willoughby to Ozieri | 4,466.45 mi (7,188.06 km) |
| Willoughby to Paceco | 4,725.19 mi (7,604.46 km) |
