| Guyancourt to Novi di Modena | 495.39 mi (797.26 km) |
| Guyancourt to Novi Ligure | 421.32 mi (678.05 km) |
| Guyancourt to Nuoro | 684.14 mi (1,101.02 km) |
| Guyancourt to Occhiobello | 521.56 mi (839.37 km) |
| Guyancourt to Oderzo | 529.76 mi (852.56 km) |
| Guyancourt to Oggiono | 398.44 mi (641.23 km) |
| Guyancourt to Olbia | 652.66 mi (1,050.35 km) |
| Guyancourt to Oleggio | 377.79 mi (607.99 km) |
| Guyancourt to Olgiate Comasco | 383.21 mi (616.72 km) |
| Guyancourt to Olgiate Olona | 386.02 mi (621.23 km) |
| Guyancourt to Omegna | 357.50 mi (575.33 km) |
| Guyancourt to Opera | 409.31 mi (658.72 km) |
| Guyancourt to Oppeano | 491.00 mi (790.18 km) |
| Guyancourt to Orbassano | 366.13 mi (589.22 km) |
| Guyancourt to Orbetello | 620.89 mi (999.23 km) |
