| Didymoteicho to Navodari | 231.51 mi (372.58 km) |
| Didymoteicho to Negresti-Oas | 475.07 mi (764.55 km) |
| Didymoteicho to Nehoiu | 276.76 mi (445.40 km) |
| Didymoteicho to Ocna Mures | 372.17 mi (598.95 km) |
| Didymoteicho to Odobesti | 306.48 mi (493.23 km) |
| Didymoteicho to Odorheiu Secuiesc | 348.12 mi (560.25 km) |
| Didymoteicho to Oltenita | 189.21 mi (304.51 km) |
| Didymoteicho to Onesti | 339.42 mi (546.24 km) |
| Didymoteicho to Oradea | 455.59 mi (733.20 km) |
| Didymoteicho to Orastie | 351.96 mi (566.43 km) |
| Didymoteicho to Oravita | 351.76 mi (566.11 km) |
| Didymoteicho to Orsova | 311.91 mi (501.97 km) |
| Didymoteicho to Otelu Rosu | 355.21 mi (571.65 km) |
| Didymoteicho to Otopeni | 222.16 mi (357.54 km) |
| Didymoteicho to Ovidiu | 227.15 mi (365.57 km) |
