| Constanta to Nottingham | 1,477.24 mi (2,377.39 km) |
| Constanta to Nuneaton | 1,484.35 mi (2,388.83 km) |
| Constanta to Oadby | 1,469.21 mi (2,364.47 km) |
| Constanta to Oakengates | 1,527.07 mi (2,457.58 km) |
| Constanta to Oakham | 1,456.13 mi (2,343.42 km) |
| Constanta to Oldbury | 1,506.78 mi (2,424.93 km) |
| Constanta to Oldham | 1,525.05 mi (2,454.34 km) |
| Constanta to Ollerton | 1,475.69 mi (2,374.90 km) |
| Constanta to Olton | 1,497.25 mi (2,409.60 km) |
| Constanta to Omagh | 1,744.69 mi (2,807.80 km) |
| Constanta to Ormesby | 1,505.48 mi (2,422.83 km) |
| Constanta to Ormskirk | 1,556.27 mi (2,504.57 km) |
| Constanta to Orpington | 1,404.67 mi (2,260.60 km) |
| Constanta to Ossett | 1,505.73 mi (2,423.24 km) |
| Constanta to Oswaldtwistle | 1,539.09 mi (2,476.93 km) |
