| Middlesbrough to Nasaud | 1,216.12 mi (1,957.15 km) |
| Middlesbrough to Navodari | 1,500.60 mi (2,414.99 km) |
| Middlesbrough to Negresti-Oas | 1,155.59 mi (1,859.75 km) |
| Middlesbrough to Nehoiu | 1,367.65 mi (2,201.01 km) |
| Middlesbrough to Ocna Mures | 1,230.62 mi (1,980.50 km) |
| Middlesbrough to Odobesti | 1,379.83 mi (2,220.63 km) |
| Middlesbrough to Odorheiu Secuiesc | 1,289.19 mi (2,074.76 km) |
| Middlesbrough to Oltenita | 1,435.31 mi (2,309.91 km) |
| Middlesbrough to Onesti | 1,348.33 mi (2,169.93 km) |
| Middlesbrough to Oradea | 1,128.69 mi (1,816.45 km) |
| Middlesbrough to Orastie | 1,228.16 mi (1,976.53 km) |
| Middlesbrough to Oravita | 1,207.47 mi (1,943.23 km) |
| Middlesbrough to Orsova | 1,247.97 mi (2,008.41 km) |
| Middlesbrough to Otelu Rosu | 1,210.73 mi (1,948.48 km) |
| Middlesbrough to Otopeni | 1,393.29 mi (2,242.29 km) |
