| West Des Moines to Orbetello | 4,992.57 mi (8,034.76 km) |
| West Des Moines to Oria | 5,328.04 mi (8,574.65 km) |
| West Des Moines to Oristano | 5,001.71 mi (8,049.47 km) |
| West Des Moines to Orta Nova | 5,215.89 mi (8,394.16 km) |
| West Des Moines to Orte | 5,036.82 mi (8,105.98 km) |
| West Des Moines to Ortona | 5,118.52 mi (8,237.46 km) |
| West Des Moines to Orvieto | 5,014.53 mi (8,070.11 km) |
| West Des Moines to Orzinuovi | 4,812.51 mi (7,744.99 km) |
| West Des Moines to Osimo | 5,031.67 mi (8,097.70 km) |
| West Des Moines to Ospitaletto | 4,810.99 mi (7,742.54 km) |
| West Des Moines to Ostuni | 5,314.90 mi (8,553.50 km) |
| West Des Moines to Ottaviano | 5,191.49 mi (8,354.89 km) |
| West Des Moines to Ovada | 4,796.63 mi (7,719.44 km) |
| West Des Moines to Ozieri | 4,988.23 mi (8,027.78 km) |
| West Des Moines to Paceco | 5,249.29 mi (8,447.91 km) |
