| Houthulst to Novi di Modena | 558.11 mi (898.19 km) |
| Houthulst to Novi Ligure | 507.36 mi (816.52 km) |
| Houthulst to Nuoro | 797.81 mi (1,283.95 km) |
| Houthulst to Occhiobello | 577.74 mi (929.78 km) |
| Houthulst to Oderzo | 565.55 mi (910.16 km) |
| Houthulst to Oggiono | 463.41 mi (745.78 km) |
| Houthulst to Olbia | 762.34 mi (1,226.87 km) |
| Houthulst to Oleggio | 453.95 mi (730.56 km) |
| Houthulst to Olgiate Comasco | 452.51 mi (728.25 km) |
| Houthulst to Olgiate Olona | 458.73 mi (738.25 km) |
| Houthulst to Omegna | 431.89 mi (695.06 km) |
| Houthulst to Opera | 482.10 mi (775.86 km) |
| Houthulst to Oppeano | 545.27 mi (877.52 km) |
| Houthulst to Orbassano | 463.65 mi (746.17 km) |
| Houthulst to Orbetello | 707.04 mi (1,137.88 km) |
