| Siverek to Orbetello | 1,512.99 mi (2,434.92 km) |
| Siverek to Oria | 1,174.60 mi (1,890.33 km) |
| Siverek to Oristano | 1,652.33 mi (2,659.17 km) |
| Siverek to Orta Nova | 1,277.68 mi (2,056.23 km) |
| Siverek to Orte | 1,453.35 mi (2,338.94 km) |
| Siverek to Ortona | 1,350.32 mi (2,173.14 km) |
| Siverek to Orvieto | 1,468.61 mi (2,363.50 km) |
| Siverek to Orzinuovi | 1,597.50 mi (2,570.92 km) |
| Siverek to Osimo | 1,405.15 mi (2,261.38 km) |
| Siverek to Ospitaletto | 1,592.51 mi (2,562.89 km) |
| Siverek to Ostuni | 1,177.96 mi (1,895.74 km) |
| Siverek to Ottaviano | 1,340.60 mi (2,157.48 km) |
| Siverek to Ovada | 1,653.03 mi (2,660.29 km) |
| Siverek to Ozieri | 1,627.50 mi (2,619.20 km) |
| Siverek to Paceco | 1,455.01 mi (2,341.62 km) |
