| Sinnai to Navodari | 1,054.97 mi (1,697.81 km) |
| Sinnai to Negresti-Oas | 923.12 mi (1,485.62 km) |
| Sinnai to Nehoiu | 965.84 mi (1,554.38 km) |
| Sinnai to Ocna Mures | 887.23 mi (1,427.85 km) |
| Sinnai to Odobesti | 1,010.18 mi (1,625.73 km) |
| Sinnai to Odorheiu Secuiesc | 946.34 mi (1,522.99 km) |
| Sinnai to Oltenita | 955.97 mi (1,538.49 km) |
| Sinnai to Onesti | 1,009.04 mi (1,623.90 km) |
| Sinnai to Oradea | 834.02 mi (1,342.23 km) |
| Sinnai to Orastie | 841.84 mi (1,354.81 km) |
| Sinnai to Oravita | 750.87 mi (1,208.41 km) |
| Sinnai to Orsova | 772.64 mi (1,243.45 km) |
| Sinnai to Otelu Rosu | 794.99 mi (1,279.41 km) |
| Sinnai to Otopeni | 937.55 mi (1,508.85 km) |
| Sinnai to Ovidiu | 1,051.64 mi (1,692.45 km) |
