| Sermoneta to Navodari | 812.11 mi (1,306.97 km) |
| Sermoneta to Negresti-Oas | 672.37 mi (1,082.07 km) |
| Sermoneta to Nehoiu | 716.92 mi (1,153.78 km) |
| Sermoneta to Ocna Mures | 635.04 mi (1,022.00 km) |
| Sermoneta to Odobesti | 760.56 mi (1,224.00 km) |
| Sermoneta to Odorheiu Secuiesc | 694.64 mi (1,117.92 km) |
| Sermoneta to Oltenita | 712.89 mi (1,147.28 km) |
| Sermoneta to Onesti | 758.11 mi (1,220.06 km) |
| Sermoneta to Oradea | 583.15 mi (938.49 km) |
| Sermoneta to Orastie | 589.86 mi (949.29 km) |
| Sermoneta to Oravita | 499.27 mi (803.49 km) |
| Sermoneta to Orsova | 522.41 mi (840.73 km) |
| Sermoneta to Otelu Rosu | 543.04 mi (873.93 km) |
| Sermoneta to Otopeni | 691.60 mi (1,113.03 km) |
| Sermoneta to Ovidiu | 809.00 mi (1,301.97 km) |
