| Houston to Opwijk | 5,032.97 mi (8,099.79 km) |
| Houston to Ostend | 4,975.82 mi (8,007.81 km) |
| Houston to Oud-Heverlee | 5,055.93 mi (8,136.74 km) |
| Houston to Oud-Turnhout | 5,053.13 mi (8,132.23 km) |
| Houston to Oudenaarde | 5,013.74 mi (8,068.83 km) |
| Houston to Oudenburg | 4,980.24 mi (8,014.92 km) |
| Houston to Oupeye | 5,097.84 mi (8,204.18 km) |
| Houston to Overijse | 5,052.29 mi (8,130.87 km) |
| Houston to Overpelt | 5,072.96 mi (8,164.14 km) |
| Houston to Paal | 5,069.14 mi (8,157.99 km) |
| Houston to Peer | 5,077.03 mi (8,170.69 km) |
| Houston to Pepinster | 5,109.11 mi (8,222.32 km) |
| Houston to Peruwelz | 5,023.20 mi (8,084.06 km) |
| Houston to Perwez | 5,068.25 mi (8,156.56 km) |
| Houston to Philippeville | 5,071.10 mi (8,161.15 km) |
