| Serpa to Navodari | 1,918.67 mi (3,087.81 km) |
| Serpa to Negresti-Oas | 1,698.47 mi (2,733.43 km) |
| Serpa to Nehoiu | 1,808.73 mi (2,910.87 km) |
| Serpa to Ocna Mures | 1,699.98 mi (2,735.86 km) |
| Serpa to Odobesti | 1,847.69 mi (2,973.57 km) |
| Serpa to Odorheiu Secuiesc | 1,767.35 mi (2,844.28 km) |
| Serpa to Oltenita | 1,820.49 mi (2,929.80 km) |
| Serpa to Onesti | 1,836.54 mi (2,955.62 km) |
| Serpa to Oradea | 1,618.19 mi (2,604.22 km) |
| Serpa to Orastie | 1,663.25 mi (2,676.75 km) |
| Serpa to Oravita | 1,582.81 mi (2,547.29 km) |
| Serpa to Orsova | 1,614.69 mi (2,598.59 km) |
| Serpa to Otelu Rosu | 1,619.52 mi (2,606.37 km) |
| Serpa to Otopeni | 1,793.74 mi (2,886.75 km) |
| Serpa to Ovidiu | 1,916.00 mi (3,083.51 km) |
