| Horten to Navodari | 1,290.88 mi (2,077.47 km) |
| Horten to Negresti-Oas | 955.54 mi (1,537.80 km) |
| Horten to Nehoiu | 1,173.58 mi (1,888.69 km) |
| Horten to Ocna Mures | 1,055.62 mi (1,698.86 km) |
| Horten to Odobesti | 1,166.66 mi (1,877.56 km) |
| Horten to Odorheiu Secuiesc | 1,092.19 mi (1,757.70 km) |
| Horten to Oltenita | 1,258.61 mi (2,025.54 km) |
| Horten to Onesti | 1,130.12 mi (1,818.75 km) |
| Horten to Oradea | 973.39 mi (1,566.52 km) |
| Horten to Orastie | 1,075.54 mi (1,730.91 km) |
| Horten to Oravita | 1,098.35 mi (1,767.62 km) |
| Horten to Orsova | 1,131.40 mi (1,820.81 km) |
| Horten to Otelu Rosu | 1,079.94 mi (1,737.99 km) |
| Horten to Otopeni | 1,217.38 mi (1,959.18 km) |
| Horten to Ovidiu | 1,292.65 mi (2,080.32 km) |
