| Trieste to Octeville | 766.65 mi (1,233.81 km) |
| Trieste to Oignies | 597.85 mi (962.15 km) |
| Trieste to Oissel | 643.47 mi (1,035.56 km) |
| Trieste to Olivet | 581.64 mi (936.06 km) |
| Trieste to Ollioules | 427.67 mi (688.27 km) |
| Trieste to Olonne-sur-Mer | 746.05 mi (1,200.65 km) |
| Trieste to Oloron-Sainte-Marie | 728.37 mi (1,172.20 km) |
| Trieste to Onet Village | 552.67 mi (889.44 km) |
| Trieste to Onnaing | 572.05 mi (920.62 km) |
| Trieste to Orange | 450.59 mi (725.16 km) |
| Trieste to Orchies | 588.50 mi (947.11 km) |
| Trieste to Orleans | 581.76 mi (936.26 km) |
| Trieste to Orly | 574.61 mi (924.75 km) |
| Trieste to Ormesson-sur-Marne | 569.19 mi (916.03 km) |
| Trieste to Orsay | 582.62 mi (937.63 km) |
