| Sintra to Nottingham | 1,053.54 mi (1,695.50 km) |
| Sintra to Nuneaton | 1,020.97 mi (1,643.09 km) |
| Sintra to Oadby | 1,032.75 mi (1,662.05 km) |
| Sintra to Oakengates | 1,015.54 mi (1,634.36 km) |
| Sintra to Oakham | 1,043.58 mi (1,679.48 km) |
| Sintra to Oldbury | 1,010.42 mi (1,626.12 km) |
| Sintra to Oldham | 1,075.20 mi (1,730.36 km) |
| Sintra to Ollerton | 1,071.26 mi (1,724.03 km) |
| Sintra to Olton | 1,009.72 mi (1,624.98 km) |
| Sintra to Omagh | 1,095.43 mi (1,762.93 km) |
| Sintra to Ormesby | 1,153.80 mi (1,856.87 km) |
| Sintra to Ormskirk | 1,065.57 mi (1,714.87 km) |
| Sintra to Orpington | 982.52 mi (1,581.22 km) |
| Sintra to Ossett | 1,092.19 mi (1,757.72 km) |
| Sintra to Oswaldtwistle | 1,083.94 mi (1,744.43 km) |
