| Gloucester to Nasaud | 1,227.68 mi (1,975.76 km) |
| Gloucester to Navodari | 1,502.81 mi (2,418.54 km) |
| Gloucester to Negresti-Oas | 1,169.36 mi (1,881.91 km) |
| Gloucester to Nehoiu | 1,369.19 mi (2,203.50 km) |
| Gloucester to Ocna Mures | 1,231.65 mi (1,982.15 km) |
| Gloucester to Odobesti | 1,387.65 mi (2,233.20 km) |
| Gloucester to Odorheiu Secuiesc | 1,295.14 mi (2,084.32 km) |
| Gloucester to Oltenita | 1,428.12 mi (2,298.34 km) |
| Gloucester to Onesti | 1,359.19 mi (2,187.41 km) |
| Gloucester to Oradea | 1,128.45 mi (1,816.06 km) |
| Gloucester to Orastie | 1,221.48 mi (1,965.79 km) |
| Gloucester to Oravita | 1,186.66 mi (1,909.74 km) |
| Gloucester to Orsova | 1,227.70 mi (1,975.79 km) |
| Gloucester to Otelu Rosu | 1,197.33 mi (1,926.91 km) |
| Gloucester to Otopeni | 1,387.42 mi (2,232.84 km) |
