| Gujan-Mestras to Oria | 990.99 mi (1,594.84 km) |
| Gujan-Mestras to Oristano | 591.55 mi (952.00 km) |
| Gujan-Mestras to Orta Nova | 876.49 mi (1,410.58 km) |
| Gujan-Mestras to Orte | 689.40 mi (1,109.49 km) |
| Gujan-Mestras to Ortona | 789.90 mi (1,271.23 km) |
| Gujan-Mestras to Orvieto | 670.88 mi (1,079.68 km) |
| Gujan-Mestras to Orzinuovi | 539.41 mi (868.09 km) |
| Gujan-Mestras to Osimo | 725.83 mi (1,168.10 km) |
| Gujan-Mestras to Ospitaletto | 546.59 mi (879.66 km) |
| Gujan-Mestras to Ostuni | 982.39 mi (1,581.00 km) |
| Gujan-Mestras to Ottaviano | 829.46 mi (1,334.88 km) |
| Gujan-Mestras to Ovada | 477.25 mi (768.07 km) |
| Gujan-Mestras to Ozieri | 582.99 mi (938.23 km) |
| Gujan-Mestras to Paceco | 841.34 mi (1,354.00 km) |
| Gujan-Mestras to Pachino | 1,005.67 mi (1,618.47 km) |
