| Harwich to Nasaud | 1,079.44 mi (1,737.19 km) |
| Harwich to Navodari | 1,356.25 mi (2,182.68 km) |
| Harwich to Negresti-Oas | 1,020.80 mi (1,642.82 km) |
| Harwich to Nehoiu | 1,222.57 mi (1,967.53 km) |
| Harwich to Ocna Mures | 1,084.90 mi (1,745.98 km) |
| Harwich to Odobesti | 1,240.09 mi (1,995.73 km) |
| Harwich to Odorheiu Secuiesc | 1,147.72 mi (1,847.08 km) |
| Harwich to Oltenita | 1,283.22 mi (2,065.15 km) |
| Harwich to Onesti | 1,211.20 mi (1,949.23 km) |
| Harwich to Oradea | 981.71 mi (1,579.91 km) |
| Harwich to Orastie | 1,076.12 mi (1,731.84 km) |
| Harwich to Oravita | 1,044.49 mi (1,680.95 km) |
| Harwich to Orsova | 1,085.49 mi (1,746.93 km) |
| Harwich to Otelu Rosu | 1,053.35 mi (1,695.21 km) |
| Harwich to Otopeni | 1,242.19 mi (1,999.12 km) |
