| SeaTac to Cockermouth | 4,538.94 mi (7,304.72 km) |
| SeaTac to Colchester | 4,798.40 mi (7,722.28 km) |
| SeaTac to Coleford | 4,710.91 mi (7,581.49 km) |
| SeaTac to Colne | 4,612.37 mi (7,422.89 km) |
| SeaTac to Colwyn Bay | 4,602.19 mi (7,406.50 km) |
| SeaTac to Congleton | 4,648.28 mi (7,480.68 km) |
| SeaTac to Conisbrough | 4,657.07 mi (7,494.83 km) |
| SeaTac to Connahs Quay | 4,623.11 mi (7,440.18 km) |
| SeaTac to Consett | 4,568.27 mi (7,351.92 km) |
| SeaTac to Conwy | 4,599.24 mi (7,401.75 km) |
| SeaTac to Cookstown | 4,450.02 mi (7,161.61 km) |
| SeaTac to Corby | 4,724.25 mi (7,602.94 km) |
| SeaTac to Corfe Mullen | 4,782.03 mi (7,695.94 km) |
| SeaTac to Corsham | 4,741.73 mi (7,631.07 km) |
| SeaTac to Coseley | 4,684.56 mi (7,539.07 km) |
