| Houten to Navodari | 1,197.28 mi (1,926.84 km) |
| Houten to Negresti-Oas | 858.37 mi (1,381.41 km) |
| Houten to Nehoiu | 1,063.66 mi (1,711.79 km) |
| Houten to Ocna Mures | 925.97 mi (1,490.21 km) |
| Houten to Odobesti | 1,079.43 mi (1,737.18 km) |
| Houten to Odorheiu Secuiesc | 987.45 mi (1,589.15 km) |
| Houten to Oltenita | 1,127.22 mi (1,814.09 km) |
| Houten to Onesti | 1,049.73 mi (1,689.38 km) |
| Houten to Oradea | 823.02 mi (1,324.52 km) |
| Houten to Orastie | 919.74 mi (1,480.18 km) |
| Houten to Oravita | 893.81 mi (1,438.45 km) |
| Houten to Orsova | 934.58 mi (1,504.05 km) |
| Houten to Otelu Rosu | 899.52 mi (1,447.63 km) |
| Houten to Otopeni | 1,085.70 mi (1,747.26 km) |
| Houten to Ovidiu | 1,197.13 mi (1,926.60 km) |
