| Olton to Cascais | 1,016.70 mi (1,636.22 km) |
| Olton to Castelo Branco | 912.94 mi (1,469.24 km) |
| Olton to Castro Daire | 847.70 mi (1,364.25 km) |
| Olton to Celorico de Basto | 817.08 mi (1,314.97 km) |
| Olton to Chamusca | 958.58 mi (1,542.68 km) |
| Olton to Chaves | 785.08 mi (1,263.46 km) |
| Olton to Cinfaes | 837.84 mi (1,348.38 km) |
| Olton to Coimbra | 901.02 mi (1,450.05 km) |
| Olton to Condeixa-a-Nova | 908.38 mi (1,461.90 km) |
| Olton to Corroios | 1,017.82 mi (1,638.03 km) |
| Olton to Coruche | 985.23 mi (1,585.58 km) |
| Olton to Costa de Caparica | 1,017.27 mi (1,637.13 km) |
| Olton to Covilha | 881.90 mi (1,419.27 km) |
| Olton to Eiras | 898.90 mi (1,446.63 km) |
| Olton to Elvas | 971.86 mi (1,564.06 km) |
