| Olbia to Bombarral | 990.71 mi (1,594.39 km) |
| Olbia to Bougado | 938.63 mi (1,510.58 km) |
| Olbia to Braga | 930.48 mi (1,497.47 km) |
| Olbia to Braganca | 844.13 mi (1,358.50 km) |
| Olbia to Cabeceiras de Basto | 909.73 mi (1,464.06 km) |
| Olbia to Cacem | 1,006.71 mi (1,620.15 km) |
| Olbia to Cadaval | 988.35 mi (1,590.59 km) |
| Olbia to Caldas da Rainha | 987.64 mi (1,589.45 km) |
| Olbia to Calheta | 1,572.05 mi (2,529.97 km) |
| Olbia to Camara de Lobos | 1,563.50 mi (2,516.21 km) |
| Olbia to Canico | 1,558.81 mi (2,508.67 km) |
| Olbia to Cantanhede | 947.91 mi (1,525.51 km) |
| Olbia to Carregal do Sal | 916.11 mi (1,474.33 km) |
| Olbia to Cartaxo | 973.10 mi (1,566.05 km) |
| Olbia to Cascais | 1,013.60 mi (1,631.24 km) |
