| Houthulst to Navodari | 1,271.96 mi (2,047.02 km) |
| Houthulst to Negresti-Oas | 941.55 mi (1,515.28 km) |
| Houthulst to Nehoiu | 1,138.44 mi (1,832.14 km) |
| Houthulst to Ocna Mures | 1,001.08 mi (1,611.08 km) |
| Houthulst to Odobesti | 1,157.86 mi (1,863.39 km) |
| Houthulst to Odorheiu Secuiesc | 1,065.22 mi (1,714.31 km) |
| Houthulst to Oltenita | 1,196.42 mi (1,925.45 km) |
| Houthulst to Onesti | 1,130.06 mi (1,818.66 km) |
| Houthulst to Oradea | 897.93 mi (1,445.07 km) |
| Houthulst to Orastie | 990.01 mi (1,593.27 km) |
| Houthulst to Oravita | 954.68 mi (1,536.41 km) |
| Houthulst to Orsova | 995.72 mi (1,602.46 km) |
| Houthulst to Otelu Rosu | 965.43 mi (1,553.72 km) |
| Houthulst to Otopeni | 1,155.85 mi (1,860.16 km) |
| Houthulst to Ovidiu | 1,271.47 mi (2,046.23 km) |
