| SeaTac to Benavente | 5,203.48 mi (8,374.19 km) |
| SeaTac to Bombarral | 5,175.29 mi (8,328.82 km) |
| SeaTac to Bougado | 5,086.26 mi (8,185.55 km) |
| SeaTac to Braga | 5,079.65 mi (8,174.90 km) |
| SeaTac to Braganca | 5,120.87 mi (8,241.24 km) |
| SeaTac to Cabeceiras de Basto | 5,093.97 mi (8,197.95 km) |
| SeaTac to Cacem | 5,196.31 mi (8,362.65 km) |
| SeaTac to Cadaval | 5,179.03 mi (8,334.84 km) |
| SeaTac to Caldas da Rainha | 5,168.61 mi (8,318.07 km) |
| SeaTac to Calheta | 5,219.32 mi (8,399.68 km) |
| SeaTac to Camara de Lobos | 5,228.22 mi (8,414.01 km) |
| SeaTac to Canico | 5,235.99 mi (8,426.51 km) |
| SeaTac to Cantanhede | 5,137.44 mi (8,267.92 km) |
| SeaTac to Carregal do Sal | 5,152.87 mi (8,292.75 km) |
| SeaTac to Cartaxo | 5,194.34 mi (8,359.48 km) |
