| SeaTac to Carrollwood (Florida) | 2,513.53 mi (4,045.13 km) |
| SeaTac to Carson (California) | 963.39 mi (1,550.43 km) |
| SeaTac to Carson City (Nevada) | 587.10 mi (944.85 km) |
| SeaTac to Carteret (New Jersey) | 2,395.52 mi (3,855.21 km) |
| SeaTac to Cartersville (Georgia) | 2,138.30 mi (3,441.26 km) |
| SeaTac to Carthage (Missouri) | 1,585.02 mi (2,550.84 km) |
| SeaTac to Cary (Illinois) | 1,692.82 mi (2,724.34 km) |
| SeaTac to Cary (North Carolina) | 2,350.72 mi (3,783.11 km) |
| SeaTac to Casa de Oro-Mount Helix (California) | 1,052.04 mi (1,693.10 km) |
| SeaTac to Casa Grande (Arizona) | 1,145.73 mi (1,843.88 km) |
| SeaTac to Casas Adobes (Arizona) | 1,199.96 mi (1,931.15 km) |
| SeaTac to Cascades (Virginia) | 2,299.33 mi (3,700.41 km) |
| SeaTac to Casper (Wyoming) | 839.13 mi (1,350.45 km) |
| SeaTac to Casselberry (Florida) | 2,538.58 mi (4,085.45 km) |
| SeaTac to Castaic (California) | 915.55 mi (1,473.44 km) |
