| Horta to Navodari | 2,932.01 mi (4,718.61 km) |
| Horta to Negresti-Oas | 2,647.03 mi (4,259.99 km) |
| Horta to Nehoiu | 2,806.84 mi (4,517.18 km) |
| Horta to Ocna Mures | 2,679.35 mi (4,312.00 km) |
| Horta to Odobesti | 2,837.91 mi (4,567.18 km) |
| Horta to Odorheiu Secuiesc | 2,748.15 mi (4,422.72 km) |
| Horta to Oltenita | 2,839.90 mi (4,570.38 km) |
| Horta to Onesti | 2,817.93 mi (4,535.01 km) |
| Horta to Oradea | 2,582.63 mi (4,156.34 km) |
| Horta to Orastie | 2,653.19 mi (4,269.90 km) |
| Horta to Oravita | 2,588.41 mi (4,165.64 km) |
| Horta to Orsova | 2,626.07 mi (4,226.25 km) |
| Horta to Otelu Rosu | 2,615.89 mi (4,209.87 km) |
| Horta to Otopeni | 2,806.00 mi (4,515.82 km) |
| Horta to Ovidiu | 2,930.22 mi (4,715.74 km) |
