| Troon to Orbetello | 1,150.69 mi (1,851.85 km) |
| Troon to Oria | 1,450.91 mi (2,335.02 km) |
| Troon to Oristano | 1,238.70 mi (1,993.50 km) |
| Troon to Orta Nova | 1,345.06 mi (2,164.67 km) |
| Troon to Orte | 1,182.51 mi (1,903.06 km) |
| Troon to Ortona | 1,248.32 mi (2,008.98 km) |
| Troon to Orvieto | 1,159.87 mi (1,866.64 km) |
| Troon to Orzinuovi | 946.34 mi (1,522.99 km) |
| Troon to Osimo | 1,157.89 mi (1,863.45 km) |
| Troon to Ospitaletto | 941.92 mi (1,515.88 km) |
| Troon to Ostuni | 1,436.46 mi (2,311.75 km) |
| Troon to Ottaviano | 1,335.21 mi (2,148.82 km) |
| Troon to Ovada | 953.27 mi (1,534.15 km) |
| Troon to Ozieri | 1,205.83 mi (1,940.59 km) |
| Troon to Paceco | 1,452.39 mi (2,337.40 km) |
