| South Houston to Nasaud | 5,932.71 mi (9,547.78 km) |
| South Houston to Navodari | 6,220.24 mi (10,010.51 km) |
| South Houston to Negresti-Oas | 5,871.59 mi (9,449.42 km) |
| South Houston to Nehoiu | 6,088.91 mi (9,799.15 km) |
| South Houston to Ocna Mures | 5,953.27 mi (9,580.86 km) |
| South Houston to Odobesti | 6,096.81 mi (9,811.88 km) |
| South Houston to Odorheiu Secuiesc | 6,008.65 mi (9,669.99 km) |
| South Houston to Oltenita | 6,159.84 mi (9,913.31 km) |
| South Houston to Onesti | 6,063.30 mi (9,757.94 km) |
| South Houston to Oradea | 5,852.54 mi (9,418.75 km) |
| South Houston to Orastie | 5,953.23 mi (9,580.80 km) |
| South Houston to Oravita | 5,932.19 mi (9,546.93 km) |
| South Houston to Orsova | 5,972.90 mi (9,612.46 km) |
| South Houston to Otelu Rosu | 5,936.42 mi (9,553.74 km) |
| South Houston to Otopeni | 6,117.59 mi (9,845.30 km) |
