| Cities | Distance |
|---|---|
| Trier to Oria | 832.59 mi (1,339.92 km) |
| Trier to Oristano | 687.24 mi (1,106.01 km) |
| Trier to Orta Nova | 727.96 mi (1,171.54 km) |
| Trier to Orte | 573.94 mi (923.67 km) |
| Trier to Ortona | 631.96 mi (1,017.03 km) |
| Trier to Orvieto | 551.73 mi (887.93 km) |
| Trier to Orzinuovi | 337.78 mi (543.61 km) |
| Trier to Osimo | 541.09 mi (870.79 km) |
| Trier to Ospitaletto | 331.24 mi (533.08 km) |
| Trier to Ostuni | 818.06 mi (1,316.54 km) |
| Trier to Ottaviano | 722.79 mi (1,163.22 km) |
| Trier to Ovada | 365.86 mi (588.80 km) |
| Trier to Ozieri | 643.98 mi (1,036.38 km) |
| Trier to Paceco | 864.38 mi (1,391.08 km) |
| Trier to Pachino | 995.00 mi (1,601.30 km) |