| Le Grand-Saconnex to Orbetello | 363.35 mi (584.75 km) |
| Le Grand-Saconnex to Oria | 699.99 mi (1,126.53 km) |
| Le Grand-Saconnex to Oristano | 454.62 mi (731.64 km) |
| Le Grand-Saconnex to Orta Nova | 585.69 mi (942.58 km) |
| Le Grand-Saconnex to Orte | 404.64 mi (651.21 km) |
| Le Grand-Saconnex to Ortona | 489.31 mi (787.47 km) |
| Le Grand-Saconnex to Orvieto | 382.30 mi (615.25 km) |
| Le Grand-Saconnex to Orzinuovi | 192.57 mi (309.92 km) |
| Le Grand-Saconnex to Osimo | 407.54 mi (655.87 km) |
| Le Grand-Saconnex to Ospitaletto | 195.92 mi (315.31 km) |
| Le Grand-Saconnex to Ostuni | 688.04 mi (1,107.29 km) |
| Le Grand-Saconnex to Ottaviano | 559.52 mi (900.46 km) |
| Le Grand-Saconnex to Ovada | 164.83 mi (265.27 km) |
| Le Grand-Saconnex to Ozieri | 416.22 mi (669.84 km) |
| Le Grand-Saconnex to Paceco | 658.00 mi (1,058.95 km) |
