| Houthulst to Oestrich-Winkel | 231.97 mi (373.33 km) |
| Houthulst to Offenburg | 282.12 mi (454.03 km) |
| Houthulst to Oftersheim | 272.85 mi (439.10 km) |
| Houthulst to Ohrdruf | 339.09 mi (545.71 km) |
| Houthulst to Ohringen | 315.12 mi (507.14 km) |
| Houthulst to Olbernhau | 453.32 mi (729.55 km) |
| Houthulst to Olching | 420.69 mi (677.04 km) |
| Houthulst to Oldenburg | 268.93 mi (432.80 km) |
| Houthulst to Oldenburg in Holstein | 403.73 mi (649.74 km) |
| Houthulst to Olfen | 197.95 mi (318.56 km) |
| Houthulst to Olpe | 212.30 mi (341.66 km) |
| Houthulst to Olsberg | 241.03 mi (387.91 km) |
| Houthulst to Oranienburg | 455.25 mi (732.65 km) |
| Houthulst to Ortenberg | 270.70 mi (435.65 km) |
| Houthulst to Oschatz | 440.51 mi (708.93 km) |
