| Belfast to Nasaud | 1,400.73 mi (2,254.26 km) |
| Belfast to Navodari | 1,683.91 mi (2,709.98 km) |
| Belfast to Negresti-Oas | 1,340.47 mi (2,157.27 km) |
| Belfast to Nehoiu | 1,550.61 mi (2,495.46 km) |
| Belfast to Ocna Mures | 1,413.21 mi (2,274.34 km) |
| Belfast to Odobesti | 1,564.05 mi (2,517.10 km) |
| Belfast to Odorheiu Secuiesc | 1,472.91 mi (2,370.41 km) |
| Belfast to Oltenita | 1,616.39 mi (2,601.32 km) |
| Belfast to Onesti | 1,533.04 mi (2,467.19 km) |
| Belfast to Oradea | 1,310.75 mi (2,109.45 km) |
| Belfast to Orastie | 1,408.94 mi (2,267.46 km) |
| Belfast to Oravita | 1,384.22 mi (2,227.69 km) |
| Belfast to Orsova | 1,425.00 mi (2,293.31 km) |
| Belfast to Otelu Rosu | 1,389.68 mi (2,236.48 km) |
| Belfast to Otopeni | 1,574.62 mi (2,534.10 km) |
