| SeaTac to Cascais | 5,196.26 mi (8,362.57 km) |
| SeaTac to Castelo Branco | 5,202.54 mi (8,372.68 km) |
| SeaTac to Castro Daire | 5,130.33 mi (8,256.46 km) |
| SeaTac to Celorico de Basto | 5,102.47 mi (8,211.63 km) |
| SeaTac to Chamusca | 5,194.01 mi (8,358.96 km) |
| SeaTac to Chaves | 5,101.01 mi (8,209.28 km) |
| SeaTac to Cinfaes | 5,113.04 mi (8,228.64 km) |
| SeaTac to Coimbra | 5,150.18 mi (8,288.42 km) |
| SeaTac to Condeixa-a-Nova | 5,152.78 mi (8,292.60 km) |
| SeaTac to Corroios | 5,210.00 mi (8,384.69 km) |
| SeaTac to Coruche | 5,213.40 mi (8,390.15 km) |
| SeaTac to Costa de Caparica | 5,205.48 mi (8,377.41 km) |
| SeaTac to Covilha | 5,177.64 mi (8,332.61 km) |
| SeaTac to Eiras | 5,148.71 mi (8,286.06 km) |
| SeaTac to Elvas | 5,265.21 mi (8,473.54 km) |
