| Sintra to Navodari | 1,982.94 mi (3,191.24 km) |
| Sintra to Negresti-Oas | 1,748.07 mi (2,813.24 km) |
| Sintra to Nehoiu | 1,869.19 mi (3,008.17 km) |
| Sintra to Ocna Mures | 1,755.84 mi (2,825.75 km) |
| Sintra to Odobesti | 1,906.71 mi (3,068.56 km) |
| Sintra to Odorheiu Secuiesc | 1,823.95 mi (2,935.36 km) |
| Sintra to Oltenita | 1,885.62 mi (3,034.61 km) |
| Sintra to Onesti | 1,893.68 mi (3,047.58 km) |
| Sintra to Oradea | 1,670.36 mi (2,688.18 km) |
| Sintra to Orastie | 1,721.09 mi (2,769.82 km) |
| Sintra to Oravita | 1,643.52 mi (2,644.99 km) |
| Sintra to Orsova | 1,676.90 mi (2,698.71 km) |
| Sintra to Otelu Rosu | 1,678.45 mi (2,701.20 km) |
| Sintra to Otopeni | 1,857.16 mi (2,988.81 km) |
| Sintra to Ovidiu | 1,980.45 mi (3,187.23 km) |
