| Triangle to Orbetello | 4,435.44 mi (7,138.15 km) |
| Triangle to Oria | 4,788.59 mi (7,706.48 km) |
| Triangle to Oristano | 4,403.50 mi (7,086.74 km) |
| Triangle to Orta Nova | 4,673.17 mi (7,520.74 km) |
| Triangle to Orte | 4,486.53 mi (7,220.37 km) |
| Triangle to Ortona | 4,578.66 mi (7,368.64 km) |
| Triangle to Orvieto | 4,465.44 mi (7,186.43 km) |
| Triangle to Orzinuovi | 4,281.25 mi (6,890.01 km) |
| Triangle to Osimo | 4,498.64 mi (7,239.87 km) |
| Triangle to Ospitaletto | 4,282.26 mi (6,891.63 km) |
| Triangle to Ostuni | 4,777.49 mi (7,688.63 km) |
| Triangle to Ottaviano | 4,636.46 mi (7,461.66 km) |
| Triangle to Ovada | 4,249.88 mi (6,839.52 km) |
| Triangle to Ozieri | 4,399.29 mi (7,079.97 km) |
| Triangle to Paceco | 4,654.19 mi (7,490.19 km) |
