| SeaTac to Collegno | 5,358.86 mi (8,624.26 km) |
| SeaTac to Cologno al Serio | 5,383.10 mi (8,663.27 km) |
| SeaTac to Cologno Monzese | 5,375.82 mi (8,651.54 km) |
| SeaTac to Colorno | 5,438.69 mi (8,752.72 km) |
| SeaTac to Comacchio | 5,496.67 mi (8,846.03 km) |
| SeaTac to Comiso | 6,027.63 mi (9,700.53 km) |
| SeaTac to Como | 5,354.37 mi (8,617.02 km) |
| SeaTac to Concordia Sagittaria | 5,448.20 mi (8,768.02 km) |
| SeaTac to Concorezzo | 5,373.65 mi (8,648.05 km) |
| SeaTac to Conegliano | 5,427.95 mi (8,735.45 km) |
| SeaTac to Conselice | 5,499.22 mi (8,850.14 km) |
| SeaTac to Conselve | 5,456.97 mi (8,782.15 km) |
| SeaTac to Conversano | 5,841.28 mi (9,400.64 km) |
| SeaTac to Copertino | 5,906.19 mi (9,505.09 km) |
| SeaTac to Copparo | 5,476.19 mi (8,813.07 km) |
