| Cheyenne to Orbetello | 5,420.33 mi (8,723.18 km) |
| Cheyenne to Oria | 5,741.57 mi (9,240.16 km) |
| Cheyenne to Oristano | 5,450.60 mi (8,771.89 km) |
| Cheyenne to Orta Nova | 5,632.81 mi (9,065.13 km) |
| Cheyenne to Orte | 5,460.37 mi (8,787.62 km) |
| Cheyenne to Ortona | 5,535.35 mi (8,908.28 km) |
| Cheyenne to Orvieto | 5,437.77 mi (8,751.25 km) |
| Cheyenne to Orzinuovi | 5,229.48 mi (8,416.03 km) |
| Cheyenne to Osimo | 5,446.18 mi (8,764.79 km) |
| Cheyenne to Ospitaletto | 5,226.66 mi (8,411.50 km) |
| Cheyenne to Ostuni | 5,727.51 mi (9,217.53 km) |
| Cheyenne to Ottaviano | 5,615.32 mi (9,036.98 km) |
| Cheyenne to Ovada | 5,221.89 mi (8,403.82 km) |
| Cheyenne to Ozieri | 5,432.54 mi (8,742.84 km) |
| Cheyenne to Paceco | 5,693.46 mi (9,162.74 km) |
