| Houilles to Navodari | 1,286.46 mi (2,070.35 km) |
| Houilles to Negresti-Oas | 973.69 mi (1,567.01 km) |
| Houilles to Nehoiu | 1,154.75 mi (1,858.38 km) |
| Houilles to Ocna Mures | 1,020.00 mi (1,641.53 km) |
| Houilles to Odobesti | 1,179.37 mi (1,898.01 km) |
| Houilles to Odorheiu Secuiesc | 1,087.05 mi (1,749.43 km) |
| Houilles to Oltenita | 1,203.80 mi (1,937.32 km) |
| Houilles to Onesti | 1,154.85 mi (1,858.55 km) |
| Houilles to Oradea | 918.56 mi (1,478.27 km) |
| Houilles to Orastie | 1,002.11 mi (1,612.74 km) |
| Houilles to Oravita | 954.35 mi (1,535.88 km) |
| Houilles to Orsova | 994.97 mi (1,601.24 km) |
| Houilles to Otelu Rosu | 971.85 mi (1,564.05 km) |
| Houilles to Otopeni | 1,165.14 mi (1,875.11 km) |
| Houilles to Ovidiu | 1,285.47 mi (2,068.76 km) |
