| Olbia to Setubal | 989.43 mi (1,592.33 km) |
| Olbia to Sever do Vouga | 932.59 mi (1,500.87 km) |
| Olbia to Silves | 994.43 mi (1,600.38 km) |
| Olbia to Sines | 999.14 mi (1,607.96 km) |
| Olbia to Sintra | 1,010.40 mi (1,626.09 km) |
| Olbia to Sobrado de Paiva | 925.23 mi (1,489.02 km) |
| Olbia to Sobral de Monte Agraco | 994.44 mi (1,600.39 km) |
| Olbia to Soure | 953.11 mi (1,533.88 km) |
| Olbia to Tabua | 918.33 mi (1,477.91 km) |
| Olbia to Tavira | 955.57 mi (1,537.84 km) |
| Olbia to Tomar | 947.40 mi (1,524.70 km) |
| Olbia to Tondela | 919.68 mi (1,480.08 km) |
| Olbia to Torre de Moncorvo | 865.48 mi (1,392.86 km) |
| Olbia to Torres Novas | 955.33 mi (1,537.46 km) |
| Olbia to Torres Vedras | 999.38 mi (1,608.34 km) |
