| Storm Lake to Orbetello | 4,996.46 mi (8,041.03 km) |
| Storm Lake to Oria | 5,328.37 mi (8,575.18 km) |
| Storm Lake to Oristano | 5,011.73 mi (8,065.61 km) |
| Storm Lake to Orta Nova | 5,217.02 mi (8,395.98 km) |
| Storm Lake to Orte | 5,039.59 mi (8,110.44 km) |
| Storm Lake to Ortona | 5,119.52 mi (8,239.08 km) |
| Storm Lake to Orvieto | 5,017.19 mi (8,074.39 km) |
| Storm Lake to Orzinuovi | 4,813.24 mi (7,746.16 km) |
| Storm Lake to Osimo | 5,031.96 mi (8,098.16 km) |
| Storm Lake to Ospitaletto | 4,811.36 mi (7,743.14 km) |
| Storm Lake to Ostuni | 5,314.97 mi (8,553.61 km) |
| Storm Lake to Ottaviano | 5,194.49 mi (8,359.72 km) |
| Storm Lake to Ovada | 4,799.63 mi (7,724.26 km) |
| Storm Lake to Ozieri | 4,996.88 mi (8,041.71 km) |
| Storm Lake to Paceco | 5,258.13 mi (8,462.15 km) |
