| Constanta to Opwijk | 1,225.65 mi (1,972.49 km) |
| Constanta to Ostend | 1,283.07 mi (2,064.91 km) |
| Constanta to Oud-Heverlee | 1,203.04 mi (1,936.11 km) |
| Constanta to Oud-Turnhout | 1,197.86 mi (1,927.77 km) |
| Constanta to Oudenaarde | 1,248.72 mi (2,009.63 km) |
| Constanta to Oudenburg | 1,279.04 mi (2,058.42 km) |
| Constanta to Oupeye | 1,159.54 mi (1,866.11 km) |
| Constanta to Overijse | 1,207.94 mi (1,943.99 km) |
| Constanta to Overpelt | 1,177.97 mi (1,895.75 km) |
| Constanta to Paal | 1,185.04 mi (1,907.13 km) |
| Constanta to Peer | 1,174.90 mi (1,890.82 km) |
| Constanta to Pepinster | 1,149.81 mi (1,850.44 km) |
| Constanta to Peruwelz | 1,244.88 mi (2,003.44 km) |
| Constanta to Perwez | 1,193.49 mi (1,920.73 km) |
| Constanta to Philippeville | 1,198.88 mi (1,929.41 km) |
