| Sintra to Noventa Vicentina | 1,158.97 mi (1,865.19 km) |
| Sintra to Novi di Modena | 1,122.16 mi (1,805.94 km) |
| Sintra to Novi Ligure | 1,020.02 mi (1,641.57 km) |
| Sintra to Nuoro | 1,000.90 mi (1,610.79 km) |
| Sintra to Occhiobello | 1,154.87 mi (1,858.59 km) |
| Sintra to Oderzo | 1,212.91 mi (1,951.99 km) |
| Sintra to Oggiono | 1,068.84 mi (1,720.14 km) |
| Sintra to Olbia | 1,010.40 mi (1,626.09 km) |
| Sintra to Oleggio | 1,032.01 mi (1,660.86 km) |
| Sintra to Olgiate Comasco | 1,051.54 mi (1,692.29 km) |
| Sintra to Olgiate Olona | 1,044.13 mi (1,680.36 km) |
| Sintra to Omegna | 1,028.84 mi (1,655.76 km) |
| Sintra to Opera | 1,053.50 mi (1,695.45 km) |
| Sintra to Oppeano | 1,142.90 mi (1,839.32 km) |
| Sintra to Orbassano | 967.74 mi (1,557.43 km) |
