| Mont-de-Marsan to Oria | 955.16 mi (1,537.18 km) |
| Mont-de-Marsan to Oristano | 542.12 mi (872.46 km) |
| Mont-de-Marsan to Orta Nova | 841.64 mi (1,354.49 km) |
| Mont-de-Marsan to Orte | 656.07 mi (1,055.85 km) |
| Mont-de-Marsan to Ortona | 757.88 mi (1,219.69 km) |
| Mont-de-Marsan to Orvieto | 638.56 mi (1,027.67 km) |
| Mont-de-Marsan to Orzinuovi | 522.98 mi (841.66 km) |
| Mont-de-Marsan to Osimo | 698.38 mi (1,123.94 km) |
| Mont-de-Marsan to Ospitaletto | 531.24 mi (854.95 km) |
| Mont-de-Marsan to Ostuni | 947.25 mi (1,524.45 km) |
| Mont-de-Marsan to Ottaviano | 791.62 mi (1,273.99 km) |
| Mont-de-Marsan to Ovada | 455.26 mi (732.68 km) |
| Mont-de-Marsan to Ozieri | 536.66 mi (863.67 km) |
| Mont-de-Marsan to Paceco | 792.67 mi (1,275.67 km) |
| Mont-de-Marsan to Pachino | 957.50 mi (1,540.94 km) |
