| Olbia to Castelo Branco | 896.73 mi (1,443.15 km) |
| Olbia to Castro Daire | 908.82 mi (1,462.60 km) |
| Olbia to Celorico de Basto | 909.49 mi (1,463.68 km) |
| Olbia to Chamusca | 954.41 mi (1,535.97 km) |
| Olbia to Chaves | 880.96 mi (1,417.77 km) |
| Olbia to Cinfaes | 917.89 mi (1,477.21 km) |
| Olbia to Coimbra | 940.70 mi (1,513.91 km) |
| Olbia to Condeixa-a-Nova | 945.41 mi (1,521.49 km) |
| Olbia to Corroios | 1,001.25 mi (1,611.35 km) |
| Olbia to Coruche | 962.81 mi (1,549.50 km) |
| Olbia to Costa de Caparica | 1,005.14 mi (1,617.61 km) |
| Olbia to Covilha | 891.50 mi (1,434.73 km) |
| Olbia to Eiras | 940.10 mi (1,512.95 km) |
| Olbia to Elvas | 892.54 mi (1,436.40 km) |
| Olbia to Entroncamento | 951.95 mi (1,532.02 km) |
