| Siirt to Orbetello | 1,642.66 mi (2,643.60 km) |
| Siirt to Oria | 1,309.42 mi (2,107.30 km) |
| Siirt to Oristano | 1,787.91 mi (2,877.36 km) |
| Siirt to Orta Nova | 1,410.21 mi (2,269.51 km) |
| Siirt to Orte | 1,582.86 mi (2,547.37 km) |
| Siirt to Ortona | 1,479.91 mi (2,381.69 km) |
| Siirt to Orvieto | 1,597.39 mi (2,570.76 km) |
| Siirt to Orzinuovi | 1,718.24 mi (2,765.24 km) |
| Siirt to Osimo | 1,531.27 mi (2,464.35 km) |
| Siirt to Ospitaletto | 1,712.68 mi (2,756.29 km) |
| Siirt to Ostuni | 1,312.10 mi (2,111.63 km) |
| Siirt to Ottaviano | 1,474.52 mi (2,373.01 km) |
| Siirt to Ovada | 1,776.52 mi (2,859.03 km) |
| Siirt to Ozieri | 1,761.71 mi (2,835.20 km) |
| Siirt to Paceco | 1,594.75 mi (2,566.50 km) |
