| SeaTac to Castle Pines (Colorado) | 1,030.00 mi (1,657.63 km) |
| SeaTac to Castle Rock (Colorado) | 1,034.40 mi (1,664.71 km) |
| SeaTac to Castro Valley (California) | 672.77 mi (1,082.72 km) |
| SeaTac to Catalina Foothills (Arizona) | 1,205.60 mi (1,940.23 km) |
| SeaTac to Cataño (Puerto Rico) | 3,718.68 mi (5,984.64 km) |
| SeaTac to Cathedral City (California) | 988.01 mi (1,590.05 km) |
| SeaTac to Catonsville (Maryland) | 2,322.04 mi (3,736.96 km) |
| SeaTac to Cave Spring (Virginia) | 2,241.20 mi (3,606.87 km) |
| SeaTac to Cayce (South Carolina) | 2,320.17 mi (3,733.96 km) |
| SeaTac to Cayey (Puerto Rico) | 3,733.84 mi (6,009.04 km) |
| SeaTac to Cedar City (Utah) | 819.81 mi (1,319.35 km) |
| SeaTac to Cedar Falls (Iowa) | 1,487.87 mi (2,394.50 km) |
| SeaTac to Cedar Hill (Texas) | 1,676.00 mi (2,697.27 km) |
| SeaTac to Cedar Lake (Indiana) | 1,755.22 mi (2,824.75 km) |
| SeaTac to Cedar Mill (Oregon) | 134.04 mi (215.71 km) |
