| Mont-de-Marsan to Navodari | 1,437.08 mi (2,312.76 km) |
| Mont-de-Marsan to Negresti-Oas | 1,177.99 mi (1,895.79 km) |
| Mont-de-Marsan to Nehoiu | 1,315.97 mi (2,117.86 km) |
| Mont-de-Marsan to Ocna Mures | 1,194.87 mi (1,922.96 km) |
| Mont-de-Marsan to Odobesti | 1,350.30 mi (2,173.09 km) |
| Mont-de-Marsan to Odorheiu Secuiesc | 1,263.72 mi (2,033.76 km) |
| Mont-de-Marsan to Oltenita | 1,342.92 mi (2,161.23 km) |
| Mont-de-Marsan to Onesti | 1,333.88 mi (2,146.68 km) |
| Mont-de-Marsan to Oradea | 1,104.17 mi (1,776.99 km) |
| Mont-de-Marsan to Orastie | 1,164.05 mi (1,873.36 km) |
| Mont-de-Marsan to Oravita | 1,093.41 mi (1,759.67 km) |
| Mont-de-Marsan to Orsova | 1,129.79 mi (1,818.22 km) |
| Mont-de-Marsan to Otelu Rosu | 1,124.04 mi (1,808.97 km) |
| Mont-de-Marsan to Otopeni | 1,310.64 mi (2,109.27 km) |
| Mont-de-Marsan to Ovidiu | 1,435.04 mi (2,309.47 km) |
