| Siirt to Oerlinghausen | 1,870.64 mi (3,010.51 km) |
| Siirt to Oestrich-Winkel | 1,861.58 mi (2,995.93 km) |
| Siirt to Offenburg | 1,842.42 mi (2,965.09 km) |
| Siirt to Oftersheim | 1,826.17 mi (2,938.93 km) |
| Siirt to Ohrdruf | 1,761.51 mi (2,834.88 km) |
| Siirt to Ohringen | 1,783.31 mi (2,869.96 km) |
| Siirt to Olbernhau | 1,650.72 mi (2,656.57 km) |
| Siirt to Olching | 1,686.59 mi (2,714.31 km) |
| Siirt to Oldenburg | 1,914.90 mi (3,081.73 km) |
| Siirt to Oldenburg in Holstein | 1,844.26 mi (2,968.05 km) |
| Siirt to Olfen | 1,917.96 mi (3,086.65 km) |
| Siirt to Olpe | 1,886.18 mi (3,035.52 km) |
| Siirt to Olsberg | 1,865.45 mi (3,002.16 km) |
| Siirt to Oranienburg | 1,711.37 mi (2,754.19 km) |
| Siirt to Ortenberg | 1,822.51 mi (2,933.05 km) |
