| Trier to Navodari | 1,095.81 mi (1,763.54 km) |
| Trier to Negresti-Oas | 772.96 mi (1,243.96 km) |
| Trier to Nehoiu | 962.76 mi (1,549.41 km) |
| Trier to Ocna Mures | 826.15 mi (1,329.56 km) |
| Trier to Odobesti | 984.40 mi (1,584.24 km) |
| Trier to Odorheiu Secuiesc | 891.71 mi (1,435.06 km) |
| Trier to Oltenita | 1,017.73 mi (1,637.88 km) |
| Trier to Onesti | 958.07 mi (1,541.87 km) |
| Trier to Oradea | 723.43 mi (1,164.25 km) |
| Trier to Orastie | 812.44 mi (1,307.50 km) |
| Trier to Oravita | 773.57 mi (1,244.94 km) |
| Trier to Orsova | 814.60 mi (1,310.97 km) |
| Trier to Otelu Rosu | 786.02 mi (1,264.98 km) |
| Trier to Otopeni | 977.69 mi (1,573.44 km) |
| Trier to Ovidiu | 1,095.14 mi (1,762.45 km) |
