| Sintra to Nuth | 1,118.24 mi (1,799.64 km) |
| Sintra to Oegstgeest | 1,138.40 mi (1,832.08 km) |
| Sintra to Oirschot | 1,128.04 mi (1,815.40 km) |
| Sintra to Oisterwijk | 1,129.14 mi (1,817.17 km) |
| Sintra to Oldebroek | 1,192.88 mi (1,919.76 km) |
| Sintra to Oldenzaal | 1,217.24 mi (1,958.96 km) |
| Sintra to Ommen | 1,211.37 mi (1,949.51 km) |
| Sintra to Oosterend | 1,225.46 mi (1,972.19 km) |
| Sintra to Oosterhout | 1,121.94 mi (1,805.58 km) |
| Sintra to Oosterwolde | 1,231.20 mi (1,981.42 km) |
| Sintra to Oostzaan | 1,163.00 mi (1,871.66 km) |
| Sintra to Opmeer | 1,178.68 mi (1,896.90 km) |
| Sintra to Oss | 1,147.68 mi (1,847.02 km) |
| Sintra to Oud-Beijerland | 1,117.55 mi (1,798.52 km) |
| Sintra to Oudenbosch | 1,109.47 mi (1,785.53 km) |
