| Sammamish to Orbetello | 5,592.89 mi (9,000.89 km) |
| Sammamish to Oria | 5,866.77 mi (9,441.65 km) |
| Sammamish to Oristano | 5,674.67 mi (9,132.49 km) |
| Sammamish to Orta Nova | 5,770.56 mi (9,286.81 km) |
| Sammamish to Orte | 5,621.09 mi (9,046.26 km) |
| Sammamish to Ortona | 5,676.90 mi (9,136.09 km) |
| Sammamish to Orvieto | 5,598.68 mi (9,010.20 km) |
| Sammamish to Orzinuovi | 5,384.19 mi (8,665.01 km) |
| Sammamish to Osimo | 5,585.97 mi (8,989.74 km) |
| Sammamish to Ospitaletto | 5,378.44 mi (8,655.77 km) |
| Sammamish to Ostuni | 5,851.13 mi (9,416.49 km) |
| Sammamish to Ottaviano | 5,770.36 mi (9,286.50 km) |
| Sammamish to Ovada | 5,396.63 mi (8,685.04 km) |
| Sammamish to Ozieri | 5,645.64 mi (9,085.78 km) |
| Sammamish to Paceco | 5,895.92 mi (9,488.56 km) |
