| Guyancourt to Navodari | 1,290.94 mi (2,077.56 km) |
| Guyancourt to Negresti-Oas | 979.68 mi (1,576.65 km) |
| Guyancourt to Nehoiu | 1,159.44 mi (1,865.94 km) |
| Guyancourt to Ocna Mures | 1,024.99 mi (1,649.56 km) |
| Guyancourt to Odobesti | 1,184.43 mi (1,906.16 km) |
| Guyancourt to Odorheiu Secuiesc | 1,092.20 mi (1,757.72 km) |
| Guyancourt to Oltenita | 1,207.78 mi (1,943.73 km) |
| Guyancourt to Onesti | 1,160.17 mi (1,867.12 km) |
| Guyancourt to Oradea | 923.76 mi (1,486.66 km) |
| Guyancourt to Orastie | 1,006.60 mi (1,619.97 km) |
| Guyancourt to Oravita | 957.94 mi (1,541.65 km) |
| Guyancourt to Orsova | 998.48 mi (1,606.90 km) |
| Guyancourt to Otelu Rosu | 975.95 mi (1,570.63 km) |
| Guyancourt to Otopeni | 1,169.30 mi (1,881.80 km) |
| Guyancourt to Ovidiu | 1,289.91 mi (2,075.91 km) |
