| Sintra to Carson (California) | 5,664.06 mi (9,115.42 km) |
| Sintra to Carson City (Nevada) | 5,480.39 mi (8,819.83 km) |
| Sintra to Carteret (New Jersey) | 3,368.67 mi (5,421.34 km) |
| Sintra to Cartersville (Georgia) | 4,079.98 mi (6,566.09 km) |
| Sintra to Carthage (Missouri) | 4,444.48 mi (7,152.69 km) |
| Sintra to Cary (Illinois) | 3,995.29 mi (6,429.80 km) |
| Sintra to Cary (North Carolina) | 3,727.55 mi (5,998.92 km) |
| Sintra to Casa de Oro-Mount Helix (California) | 5,657.74 mi (9,105.25 km) |
| Sintra to Casa Grande (Arizona) | 5,420.47 mi (8,723.40 km) |
| Sintra to Casas Adobes (Arizona) | 5,410.95 mi (8,708.08 km) |
| Sintra to Cascades (Virginia) | 3,563.59 mi (5,735.05 km) |
| Sintra to Casper (Wyoming) | 4,772.83 mi (7,681.12 km) |
| Sintra to Casselberry (Florida) | 4,087.66 mi (6,578.46 km) |
| Sintra to Castaic (California) | 5,650.30 mi (9,093.27 km) |
| Sintra to Castle Pines (Colorado) | 4,841.83 mi (7,792.18 km) |
