| Prospect Heights to Cascais | 3,985.75 mi (6,414.45 km) |
| Prospect Heights to Castelo Branco | 4,034.50 mi (6,492.90 km) |
| Prospect Heights to Castro Daire | 3,976.93 mi (6,400.26 km) |
| Prospect Heights to Celorico de Basto | 3,957.29 mi (6,368.64 km) |
| Prospect Heights to Chamusca | 4,005.96 mi (6,446.97 km) |
| Prospect Heights to Chaves | 3,968.76 mi (6,387.11 km) |
| Prospect Heights to Cinfaes | 3,961.00 mi (6,374.61 km) |
| Prospect Heights to Coimbra | 3,978.30 mi (6,402.46 km) |
| Prospect Heights to Condeixa-a-Nova | 3,978.35 mi (6,402.54 km) |
| Prospect Heights to Corroios | 4,001.10 mi (6,439.14 km) |
| Prospect Heights to Coruche | 4,017.84 mi (6,466.09 km) |
| Prospect Heights to Costa de Caparica | 3,996.11 mi (6,431.11 km) |
| Prospect Heights to Covilha | 4,018.05 mi (6,466.43 km) |
| Prospect Heights to Eiras | 3,977.46 mi (6,401.10 km) |
| Prospect Heights to Elvas | 4,084.42 mi (6,573.24 km) |
