| SeaTac to Cortona | 5,577.66 mi (8,976.38 km) |
| SeaTac to Cosenza | 5,923.99 mi (9,533.74 km) |
| SeaTac to Cossato | 5,345.47 mi (8,602.71 km) |
| SeaTac to Costa Volpino | 5,378.30 mi (8,655.54 km) |
| SeaTac to Creazzo | 5,429.75 mi (8,738.33 km) |
| SeaTac to Crema | 5,395.53 mi (8,683.26 km) |
| SeaTac to Cremona | 5,418.10 mi (8,719.58 km) |
| SeaTac to Crevalcore | 5,470.53 mi (8,803.97 km) |
| SeaTac to Crispiano | 5,866.71 mi (9,441.56 km) |
| SeaTac to Crosia | 5,919.82 mi (9,527.03 km) |
| SeaTac to Crotone | 5,958.05 mi (9,588.55 km) |
| SeaTac to Cuneo | 5,398.92 mi (8,688.72 km) |
| SeaTac to Cuorgne | 5,342.59 mi (8,598.07 km) |
| SeaTac to Cusano Milanino | 5,372.17 mi (8,645.68 km) |
| SeaTac to Cutro | 5,958.00 mi (9,588.48 km) |
