| Ponca City to Cascais | 4,591.44 mi (7,389.21 km) |
| Ponca City to Castelo Branco | 4,642.99 mi (7,472.16 km) |
| Ponca City to Castro Daire | 4,586.46 mi (7,381.20 km) |
| Ponca City to Celorico de Basto | 4,567.30 mi (7,350.35 km) |
| Ponca City to Chamusca | 4,613.25 mi (7,424.31 km) |
| Ponca City to Chaves | 4,579.33 mi (7,369.72 km) |
| Ponca City to Cinfaes | 4,570.65 mi (7,355.76 km) |
| Ponca City to Coimbra | 4,586.77 mi (7,381.69 km) |
| Ponca City to Condeixa-a-Nova | 4,586.66 mi (7,381.52 km) |
| Ponca City to Corroios | 4,606.84 mi (7,413.99 km) |
| Ponca City to Coruche | 4,624.54 mi (7,442.47 km) |
| Ponca City to Costa de Caparica | 4,601.84 mi (7,405.94 km) |
| Ponca City to Covilha | 4,627.10 mi (7,446.60 km) |
| Ponca City to Eiras | 4,585.97 mi (7,380.41 km) |
| Ponca City to Elvas | 4,691.89 mi (7,550.86 km) |
