| Sinaia to Oerlinghausen | 892.86 mi (1,436.92 km) |
| Sinaia to Oestrich-Winkel | 874.88 mi (1,407.99 km) |
| Sinaia to Offenburg | 856.91 mi (1,379.06 km) |
| Sinaia to Oftersheim | 839.09 mi (1,350.39 km) |
| Sinaia to Ohrdruf | 779.66 mi (1,254.75 km) |
| Sinaia to Ohringen | 796.24 mi (1,281.43 km) |
| Sinaia to Olbernhau | 672.44 mi (1,082.19 km) |
| Sinaia to Olching | 700.60 mi (1,127.50 km) |
| Sinaia to Oldenburg | 945.55 mi (1,521.72 km) |
| Sinaia to Oldenburg in Holstein | 896.65 mi (1,443.01 km) |
| Sinaia to Olfen | 936.89 mi (1,507.78 km) |
| Sinaia to Olpe | 902.22 mi (1,451.99 km) |
| Sinaia to Olsberg | 883.67 mi (1,422.12 km) |
| Sinaia to Oranienburg | 754.87 mi (1,214.85 km) |
| Sinaia to Ortenberg | 837.03 mi (1,347.08 km) |
