| Antrim to Nasaud | 1,412.86 mi (2,273.78 km) |
| Antrim to Navodari | 1,696.26 mi (2,729.87 km) |
| Antrim to Negresti-Oas | 1,352.55 mi (2,176.72 km) |
| Antrim to Nehoiu | 1,563.00 mi (2,515.41 km) |
| Antrim to Ocna Mures | 1,425.65 mi (2,294.36 km) |
| Antrim to Odobesti | 1,576.26 mi (2,536.74 km) |
| Antrim to Odorheiu Secuiesc | 1,485.19 mi (2,390.18 km) |
| Antrim to Oltenita | 1,629.01 mi (2,621.64 km) |
| Antrim to Onesti | 1,545.16 mi (2,486.70 km) |
| Antrim to Oradea | 1,323.24 mi (2,129.56 km) |
| Antrim to Orastie | 1,421.58 mi (2,287.81 km) |
| Antrim to Oravita | 1,397.20 mi (2,248.57 km) |
| Antrim to Orsova | 1,437.96 mi (2,314.17 km) |
| Antrim to Otelu Rosu | 1,402.49 mi (2,257.09 km) |
| Antrim to Otopeni | 1,587.21 mi (2,554.37 km) |
