| London Colney to Nasaud | 1,144.07 mi (1,841.21 km) |
| London Colney to Navodari | 1,419.24 mi (2,284.05 km) |
| London Colney to Negresti-Oas | 1,085.80 mi (1,747.43 km) |
| London Colney to Nehoiu | 1,285.61 mi (2,069.00 km) |
| London Colney to Ocna Mures | 1,148.06 mi (1,847.62 km) |
| London Colney to Odobesti | 1,304.01 mi (2,098.61 km) |
| London Colney to Odorheiu Secuiesc | 1,211.50 mi (1,949.73 km) |
| London Colney to Oltenita | 1,344.80 mi (2,164.25 km) |
| London Colney to Onesti | 1,275.57 mi (2,052.83 km) |
| London Colney to Oradea | 1,044.85 mi (1,681.52 km) |
| London Colney to Orastie | 1,138.07 mi (1,831.54 km) |
| London Colney to Oravita | 1,103.92 mi (1,776.59 km) |
| London Colney to Orsova | 1,144.96 mi (1,842.64 km) |
| London Colney to Otelu Rosu | 1,114.17 mi (1,793.08 km) |
| London Colney to Otopeni | 1,304.04 mi (2,098.65 km) |
