| Willowbrook to Orbetello | 6,267.98 mi (10,087.34 km) |
| Willowbrook to Oria | 6,577.04 mi (10,584.72 km) |
| Willowbrook to Oristano | 6,311.62 mi (10,157.56 km) |
| Willowbrook to Orta Nova | 6,471.52 mi (10,414.91 km) |
| Willowbrook to Orte | 6,304.88 mi (10,146.73 km) |
| Willowbrook to Ortona | 6,374.62 mi (10,258.95 km) |
| Willowbrook to Orvieto | 6,282.20 mi (10,110.23 km) |
| Willowbrook to Orzinuovi | 6,070.80 mi (9,770.00 km) |
| Willowbrook to Osimo | 6,284.35 mi (10,113.68 km) |
| Willowbrook to Ospitaletto | 6,067.09 mi (9,764.03 km) |
| Willowbrook to Ostuni | 6,562.39 mi (10,561.14 km) |
| Willowbrook to Ottaviano | 6,459.12 mi (10,394.94 km) |
| Willowbrook to Ovada | 6,068.96 mi (9,767.05 km) |
| Willowbrook to Ozieri | 6,290.86 mi (10,124.16 km) |
| Willowbrook to Paceco | 6,550.54 mi (10,542.08 km) |
